![Thornton Lakes 25929](https://upload.wikimedia.org/wikipedia/commons/b/b6/Thornton_Lakes_25929.JPG)
A (; from the Latin word ') is an
amphitheatre
An amphitheatre (British English) or amphitheater (American English; both ) is an open-air venue used for entertainment, performances, and sports. The term derives from the ancient Greek ('), from ('), meaning "on both sides" or "around" and ...
-like
valley
A valley is an elongated low area often running between Hill, hills or Mountain, mountains, which will typically contain a river or stream running from one end to the other. Most valleys are formed by erosion of the land surface by rivers ...
formed by
glacial
A glacial period (alternatively glacial or glaciation) is an interval of time (thousands of years) within an ice age that is marked by colder temperatures and glacier advances. Interglacials, on the other hand, are periods of warmer climate betw ...
erosion
Erosion is the action of surface processes (such as water flow or wind) that removes soil, rock, or dissolved material from one location on the Earth's crust, and then transports it to another location where it is deposited. Erosion is distin ...
. Alternative names for this landform are corrie (from
Scottish Gaelic
Scottish Gaelic ( gd, Gàidhlig ), also known as Scots Gaelic and Gaelic, is a Goidelic language (in the Celtic branch of the Indo-European language family) native to the Gaels of Scotland. As a Goidelic language, Scottish Gaelic, as well as ...
, meaning a pot or
cauldron
A cauldron (or caldron) is a large pot (kettle) for cooking or boiling over an open fire, with a lid and frequently with an arc-shaped hanger and/or integral handles or feet. There is a rich history of cauldron lore in religion, mythology, and ...
) and (; ). A cirque may also be a similarly shaped landform arising from fluvial erosion.
The concave shape of a glacial cirque is open on the downhill side, while the cupped section is generally steep. Cliff-like slopes, down which ice and glaciated debris combine and converge, form the three or more higher sides. The floor of the cirque ends up bowl-shaped, as it is the complex
convergence zone
A convergence zone in meteorology is a region in the atmosphere where two prevailing flows meet and interact, usually resulting in distinctive weather conditions.
This causes a mass accumulation that eventually leads to a vertical movement and ...
of combining ice flows from multiple directions and their accompanying rock burdens. Hence, it experiences somewhat greater erosion forces and is most often
overdeepened below the level of the cirque's low-side outlet (stage) and its down-slope (backstage) valley. If the cirque is subject to seasonal melting, the floor of the cirque most often forms a
tarn (small lake) behind a dam, which marks the downstream limit of the glacial overdeepening. The dam itself can be composed of
moraine
A moraine is any accumulation of unconsolidated debris (regolith and rock), sometimes referred to as glacial till, that occurs in both currently and formerly glaciated regions, and that has been previously carried along by a glacier or ice shee ...
,
glacial till
image:Geschiebemergel.JPG, Closeup of glacial till. Note that the larger grains (pebbles and gravel) in the till are completely surrounded by the matrix of finer material (silt and sand), and this characteristic, known as ''matrix support'', is d ...
, or a lip of the underlying
bedrock
In geology, bedrock is solid Rock (geology), rock that lies under loose material (regolith) within the crust (geology), crust of Earth or another terrestrial planet.
Definition
Bedrock is the solid rock that underlies looser surface mater ...
.
The fluvial cirque or , found in
karst
Karst is a topography formed from the dissolution of soluble rocks such as limestone, dolomite, and gypsum. It is characterized by underground drainage systems with sinkholes and caves. It has also been documented for more weathering-resistant ro ...
landscapes, is formed by intermittent river flow cutting through layers of limestone and chalk leaving sheer cliffs. A common feature for all
fluvial
In geography and geology, fluvial processes are associated with rivers and streams and the deposits and landforms created by them. When the stream or rivers are associated with glaciers, ice sheets, or ice caps, the term glaciofluvial or fluviog ...
-erosion cirques is a terrain which includes erosion resistant upper structures overlying materials which are more easily eroded.
Formation
Glacial-erosion cirque formation
Glacial cirques are found amongst mountain ranges throughout the world; 'classic' cirques are typically about one kilometer long and one kilometer wide. Situated high on a mountainside near the
firn line
__NOTOC__
Firn (; from Swiss German "last year's", cognate with ''before'') is partially compacted névé, a type of snow that has been left over from past seasons and has been recrystallized into a substance denser than névé. It is ice that ...
, they are typically partially surrounded on three sides by steep
cliff
In geography and geology, a cliff is an area of rock which has a general angle defined by the vertical, or nearly vertical. Cliffs are formed by the processes of weathering and erosion, with the effect of gravity. Cliffs are common on co ...
s. The highest cliff is often called a
headwall
In physical geography and geology the headwall of a glacial cirque is its highest cliff. The term has been more broadly used to describe similar geomorphic features of non-glacial origin consisting of a concave depression with convergent slopes ty ...
. The fourth side forms the ''lip'', ''threshold'' or ''sill'',
the side at which the glacier flowed away from the cirque. Many glacial cirques contain
tarns
A tarn (or corrie loch) is a proglacial mountain lake, pond or pool, formed in a cirque excavated by a glacier. A moraine may form a natural dam below a tarn.
Etymology
The word is derived from the Old Norse word ''tjörn'' ("a small mount ...
dammed by either till (debris) or a bedrock threshold. When enough snow accumulates, it can flow out the opening of the bowl and form valley glaciers which may be several kilometers long.
Cirques form in conditions which are favorable; in the Northern Hemisphere the conditions include the north-east slope, where they are protected from the majority of the Sun's energy and from the prevailing winds. These areas are sheltered from heat, encouraging the accumulation of snow; if the accumulation of snow increases, the snow turns into glacial ice. The process of
nivation
Nivation is the set of geomorphic processes associated with snow patches. The primary processes are mass wasting and the freeze and thaw cycle, in which fallen snow gets compacted into firn or névé. The importance of the processes covered by the ...
follows, whereby a hollow in a slope may be enlarged by
ice segregation
Ice segregation is the geological phenomenon produced by the formation of ice lenses, which induce erosion when moisture, diffused within soil or rock, accumulates in a localized zone. The ice initially accumulates within small collocated pores o ...
weathering and glacial erosion. Ice segregation erodes the vertical rock face and causes it to disintegrate, which may result in an avalanche bringing down more snow and rock to add to the growing glacier.
Eventually, this hollow may become large enough that glacial erosion intensifies. The enlarging of this open ended concavity creates a larger leeward deposition zone, furthering the process of glaciation. Debris (or till) in the ice also may
abrade the bed surface; should ice move down a slope it would have a ‘sandpaper effect’ on the
bedrock
In geology, bedrock is solid Rock (geology), rock that lies under loose material (regolith) within the crust (geology), crust of Earth or another terrestrial planet.
Definition
Bedrock is the solid rock that underlies looser surface mater ...
beneath, on which it scrapes.
![Lowercurtis](https://upload.wikimedia.org/wikipedia/commons/8/83/Lowercurtis.jpg)
Eventually, the hollow may become a large
bowl
A bowl is a typically round dish or container generally used for preparing, serving, or consuming food. The interior of a bowl is characteristically shaped like a spherical cap, with the edges and the bottom forming a seamless curve. This makes ...
shape in the side of the mountain, with the headwall being weathered by ice segregation, and as well as being eroded by
plucking. The basin will become deeper as it continues to be eroded by ice segregation and abrasion.
Should ice segregation, plucking and abrasion continue, the dimensions of the cirque will increase, but the proportion of the landform would remain roughly the same. A
bergschrund
A bergschrund (from the German for ''mountain cleft'') or rimaye (from French; ) is a crevasse that forms where moving glacier ice separates from the stagnant ice or firn above. It is often a serious obstacle for mountaineers, who sometimes abb ...
forms when the movement of the glacier separates the moving ice from the stationary ice, forming a crevasse. The method of erosion of the headwall lying between the surface of the glacier and the cirque's floor has been attributed to freeze-thaw mechanisms. The temperature within the bergschrund changes very little, however, studies have shown that ice segregation (frost shattering) may happen with only small changes in temperature. Water that flows into the bergschrund can be cooled to freezing temperatures by the surrounding ice, allowing freeze-thaw mechanisms to occur.
![Lake Seal Mt Field NP edit](https://upload.wikimedia.org/wikipedia/commons/8/89/Lake_Seal_Mt_Field_NP_edit.jpg)
If two adjacent cirques erode toward one another, an
arête
An arête ( ) is a narrow ridge of rock which separates two valleys. It is typically formed when two glaciers erode parallel U-shaped valleys. Arêtes can also form when two glacial cirques erode headwards towards one another, although frequen ...
, or steep sided ridge, forms. When three or more cirques erode toward one another, a
pyramidal peak
A pyramidal peak, sometimes called a glacial horn in extreme cases, is an angular, sharply pointed mountain peak which results from the cirque erosion due to multiple glaciers diverging from a central point. Pyramidal peaks are often examples o ...
is created. In some cases, this peak will be made accessible by one or more arêtes. The
Matterhorn
The (, ; it, Cervino, ; french: Cervin, ; rm, Matterhorn) is a mountain of the Alps, straddling the main watershed and border between Switzerland and Italy. It is a large, near-symmetric pyramidal peak in the extended Monte Rosa area of the ...
in the European
Alps
The Alps () ; german: Alpen ; it, Alpi ; rm, Alps ; sl, Alpe . are the highest and most extensive mountain range system that lies entirely in Europe, stretching approximately across seven Alpine countries (from west to east): France, Sw ...
is an example of such a peak.
Where cirques form one behind the other, a
cirque stairway
A cirque stairway or sequence of cirque steps is a stepped succession of glacially eroded rock basins.Whittow, John (1984). ''Dictionary of Physical Geography''. London: Penguin, 1984, p. 95. . Their individual formation is that of a cirque.
Thes ...
results, as at the
Zastler Loch
The Zastler Loch or Zastler Cirque (german: Zastlerkar) on the northern side of the Feldberg summit in the Black Forest is the highest cirque in the German Central Uplands. It forms the head of the Zastler valley, through which the Zastlerbach s ...
in the
Black Forest
The Black Forest (german: Schwarzwald ) is a large forested mountain range in the state of Baden-Württemberg in southwest Germany, bounded by the Rhine Valley to the west and south and close to the borders with France and Switzerland. It is t ...
.
As glaciers can only originate above the snowline, studying the location of present-day cirques provides information on past glaciation patterns and on climate change.
Fluvial-erosion cirque formation
![BoutDuMonde2](https://upload.wikimedia.org/wikipedia/commons/b/bc/BoutDuMonde2.jpg)
Although a less common usage, the term cirque is also used for amphitheatre-shaped, fluvial-erosion features. For example, an approximately anticlinal erosion cirque is at on the southern boundary of the
Negev highlands. This erosional cirque or ' was formed by intermittent river flow in the
Makhtesh Ramon cutting through layers of limestone and chalk, resulting in cirque walls with a sheer drop.
The
Cirque du Bout du Monde
A fluvial cirque is a steephead valley formed in a Karst landscape.
In Europe In France
* Cirque du Bout du Monde (Côte d'Or) in Burgundy
* Cirque du Bout du Monde (Herault) in Languedoc
Cirques of Metropolitan France, Bout du Monde
{{geol ...
is another such feature, created in
karst
Karst is a topography formed from the dissolution of soluble rocks such as limestone, dolomite, and gypsum. It is characterized by underground drainage systems with sinkholes and caves. It has also been documented for more weathering-resistant ro ...
terraine in the
Burgundy region of the department of in
France
France (), officially the French Republic ( ), is a country primarily located in Western Europe. It also comprises of Overseas France, overseas regions and territories in the Americas and the Atlantic Ocean, Atlantic, Pacific Ocean, Pac ...
.
Yet another type of fluvial erosion-formed cirque is found on
Réunion island
Réunion (; french: La Réunion, ; previously ''Île Bourbon''; rcf, label= Reunionese Creole, La Rényon) is an island in the Indian Ocean that is an overseas department and region of France. It is located approximately east of the island o ...
, which includes the tallest volcanic structure in the
Indian Ocean
The Indian Ocean is the third-largest of the world's five oceanic divisions, covering or ~19.8% of the water on Earth's surface. It is bounded by Asia to the north, Africa to the west and Australia to the east. To the south it is bounded by th ...
. The island consists of an active shield-volcano () and an extinct, deeply eroded volcano (
Piton des Neiges
The Piton des Neiges (Snow Peak) is a massive 3,069 m (10,069 ft) shield volcano on Réunion, one of the French volcanic islands in the Mascarene Archipelago in the southwestern Indian Ocean. It is located about east of Madagascar. ...
). Three cirques have eroded there in a sequence of agglomerated, fragmented rock and volcanic
breccia
Breccia () is a rock composed of large angular broken fragments of minerals or rocks cemented together by a fine-grained matrix.
The word has its origins in the Italian language, in which it means "rubble". A breccia may have a variety of di ...
associated with
pillow lavas
Pillow lavas are lavas that contain characteristic pillow-shaped structures that are attributed to the extrusion of the lava underwater, or ''subaqueous extrusion''. Pillow lavas in volcanic rock are characterized by thick sequences of disconti ...
overlain by more coherent, solid lavas.
A common feature for all fluvial-erosion cirques is a terrain which includes erosion resistant upper structures overlying materials which are more easily eroded.
Notable cirques
![Gavarnie-Cirque](https://upload.wikimedia.org/wikipedia/commons/9/90/Gavarnie-Cirque.JPG)
* Australia
**
Blue Lake Cirque,
New South Wales
)
, nickname =
, image_map = New South Wales in Australia.svg
, map_caption = Location of New South Wales in AustraliaCoordinates:
, subdivision_type = Country
, subdivision_name = Australia
, established_title = Before federation
, es ...
, Australia
* Asia
**
Chandra Taal
Tso Chigma or Chandra Taal (meaning the ''Lake of the Moon''), or Chandra Tal is a lake in the spiti part of the Lahul and Spiti district of Himachal Pradesh, India. Chandra Taal is near the source of the Chandra River. Despite the rugged a ...
,
Himachal Pradesh
Himachal Pradesh (; ; "Snow-laden Mountain Province") is a state in the northern part of India. Situated in the Western Himalayas, it is one of the thirteen mountain states and is characterized by an extreme landscape featuring several peaks ...
, India
** Cirque Valley,
Hindu Kush
The Hindu Kush is an mountain range in Central and South Asia to the west of the Himalayas. It stretches from central and western Afghanistan, Quote: "The Hindu Kush mountains run along the Afghan border with the North-West Frontier Provinc ...
, Pakistan
**
Makhtesh Ramon,
Negev desert, Israel
**
Western Cwm
The Western Cwm () is a broad, flat, gently undulating glacial valley basin terminating at the foot of the Lhotse Face of Mount Everest. It was named by George Mallory when he saw it in 1921 as part of the British Reconnaissance Expedition that ...
,
Khumbu Himal, Nepal
* Europe (glacial)
**
Cadair Idris
Cadair Idris or Cader Idris is a mountain in the Meirionnydd area of Gwynedd, Wales. It lies at the southern end of the Snowdonia National Park near the town of Dolgellau. The peak, which is one of the most popular in Wales for walkers and hiker ...
, Wales
**
Circo de Gredos,
Sierra de Gredos
The Sierra de Gredos is a mountain range in central Spain that spans the provinces of Ávila, Salamanca, Cáceres, Madrid, and Toledo. It is part of the much larger Sistema Central of mountain ranges. Its highest point is Pico Almanzor, at 2,5 ...
, Spain
**
Cirque de Gavarnie __NOTOC__
The Cirque de Gavarnie is a cirque in the central Pyrenees, in Southwestern France, close to the border of Spain. It is within the commune of Gavarnie, the department of Hautes-Pyrénées, and the Pyrénées National Park. Major feat ...
,
Pyrenees
The Pyrenees (; es, Pirineos ; french: Pyrénées ; ca, Pirineu ; eu, Pirinioak ; oc, Pirenèus ; an, Pirineus) is a mountain range straddling the border of France and Spain. It extends nearly from its union with the Cantabrian Mountains to C ...
, France
**
Cirque d'Estaubé
The Cirque d'Estaubé is a cirque in the central Pyrenees in the Pyrenees National Park, forming the frontier between France and Spain. The cirque lies 4 km to the east of its better known neighbour, the Cirque de Gavarnie __NOTOC__
The C ...
,
Pyrenees
The Pyrenees (; es, Pirineos ; french: Pyrénées ; ca, Pirineu ; eu, Pirinioak ; oc, Pirenèus ; an, Pirineus) is a mountain range straddling the border of France and Spain. It extends nearly from its union with the Cantabrian Mountains to C ...
, France
**
Cirque de Troumouse
A (; from the Latin word ') is an Amphitheatre#Natural amphitheatres, amphitheatre-like valley formed by glacier, glacial erosion. Alternative names for this landform are corrie (from Scottish Gaelic language, Scottish Gaelic , meaning a pot o ...
,
Pyrenees
The Pyrenees (; es, Pirineos ; french: Pyrénées ; ca, Pirineu ; eu, Pirinioak ; oc, Pirenèus ; an, Pirineus) is a mountain range straddling the border of France and Spain. It extends nearly from its union with the Cantabrian Mountains to C ...
, France
**
Cirque du Fer à Cheval
A (; from the Latin word ') is an amphitheatre-like valley formed by glacial erosion. Alternative names for this landform are corrie (from Scottish Gaelic , meaning a pot or cauldron) and (; ). A cirque may also be a similarly shaped landform ...
,
Savoy Alps, France
**
Maritsa
Maritsa or Maritza ( bg, Марица ), also known as Meriç ( tr, Meriç ) and Evros ( ell, Έβρος ), is a river that runs through the Balkans in Southeast Europe. With a length of ,[Rila
Rila ( bg, Рила, ) is the highest mountain range of Bulgaria, the Balkans, Balkan Peninsula and Southeast Europe. It is situated in southwestern Bulgaria and forms part of the Rila–Rhodope Mountains, Rhodope Massif. The highest summit is Mus ...]
Mountain, Bulgaria
**
Malyovitsa
Malyovitsa ( bg, Мальовица ) is a peak in the northwestern part of the Rila Mountain in southwestern Bulgaria. It is 2,729 m high and is one of the most popular tourist regions in the mountain. Its northern and eastern slopes are ste ...
cirque,
Rila
Rila ( bg, Рила, ) is the highest mountain range of Bulgaria, the Balkans, Balkan Peninsula and Southeast Europe. It is situated in southwestern Bulgaria and forms part of the Rila–Rhodope Mountains, Rhodope Massif. The highest summit is Mus ...
Mountain, Bulgaria
**
Seven Rila Lakes
The Seven Rila Lakes ( bg, Седемте рилски езера, Sedemte rilski ezera, ) are a group of glacial lakes, situated in the northwestern Rila Mountain in Bulgaria. They are the most visited group of lakes in Bulgaria. The lakes are s ...
cirques,
Rila
Rila ( bg, Рила, ) is the highest mountain range of Bulgaria, the Balkans, Balkan Peninsula and Southeast Europe. It is situated in southwestern Bulgaria and forms part of the Rila–Rhodope Mountains, Rhodope Massif. The highest summit is Mus ...
Mountain, Bulgaria
**
Banderishki cirque,
Pirin
, photo=Pirin-mountains-Bansko.jpg
, photo_caption=Pirin scenery in winter
, country= Bulgaria,
, parent=
, geology= granite, gneiss, marble, limestone
, area_km2=2585
, range_coordinates =
, length_km=80 , length_orientation= north-s ...
Mountain, Bulgaria
** ,
Grampian Mountains
The Grampian Mountains (''Am Monadh'' in Scottish Gaelic, Gaelic) is one of the three major mountain ranges in Scotland, that together occupy about half of Scotland. The other two ranges are the Northwest Highlands and the Southern Uplands. T ...
,
Scottish Highlands
The Highlands ( sco, the Hielands; gd, a’ Ghàidhealtachd , 'the place of the Gaels') is a historical region of Scotland. Culturally, the Highlands and the Lowlands diverged from the Late Middle Ages into the modern period, when Lowland Sco ...
**
Śnieżne Kotły
Śnieżne Kotły (, cs, Sněžné jámy, german: Schneegruben, literally ''Snowy Pits'', ''Snowy Cirque'', ''Snowy Cwm'') are two glacial cirques situated in Poland in the Sudetes in the Karkonosze National Park. They are a unique example of ...
,
Karkonosze
The Giant Mountains, Krkonoše or Karkonosze (Czech: , Polish: , german: Riesengebirge) are a mountain range located in the north of the Czech Republic and the south-west of Poland, part of the Sudetes mountain system (part of the Bohemian Massi ...
, Poland
** Coumshingaun Lake,
County Waterford
County Waterford ( ga, Contae Phort Láirge) is a Counties of Ireland, county in Republic of Ireland, Ireland. It is in the Provinces of Ireland, province of Munster and is part of the South-East Region, Ireland, South-East Region. It is named ...
, Ireland
* Europe (fluvial)
**
Cirque de Navacelles
210px, Here the magnificence of the valley is shown. The river's meandering erosion is clear.
The Cirque de Navacelles is large erosional landform, an incised meander, located towards the southern edge of the Massif Central mountain range in Fran ...
, Grande Causses, France
**
Cirque du Bout du Monde
A fluvial cirque is a steephead valley formed in a Karst landscape.
In Europe In France
* Cirque du Bout du Monde (Côte d'Or) in Burgundy
* Cirque du Bout du Monde (Herault) in Languedoc
Cirques of Metropolitan France, Bout du Monde
{{geol ...
, Grande Causses, France
**
Cirque du Bout du Monde
A fluvial cirque is a steephead valley formed in a Karst landscape.
In Europe In France
* Cirque du Bout du Monde (Côte d'Or) in Burgundy
* Cirque du Bout du Monde (Herault) in Languedoc
Cirques of Metropolitan France, Bout du Monde
{{geol ...
,
Burgundy
Burgundy (; french: link=no, Bourgogne ) is a historical territory and former administrative region and province of east-central France. The province was once home to the Dukes of Burgundy from the early 11th until the late 15th century. The c ...
, France
* North America
**
Cirque of the Towers
The Cirque of the Towers is located in the Wind River Range Wyoming, U.S., part of which is in the Bridger Wilderness in Bridger-Teton National Forest, while the remainder is in the Popo Agie Wilderness in Shoshone National Forest. Located in ...
,
Wyoming
Wyoming () is a U.S. state, state in the Mountain states, Mountain West subregion of the Western United States. It is bordered by Montana to the north and northwest, South Dakota and Nebraska to the east, Idaho to the west, Utah to the south ...
, United States
**
Iceberg Cirque
The Iceberg Cirque is a large cirque (landform), cirque that has been carved out by glaciation. It is located in Glacier National Park (U.S.), Glacier National Park in the U.S. state of Montana. It is near Iceberg Lake in the Many Glacier section ...
,
Montana
Montana () is a state in the Mountain West division of the Western United States. It is bordered by Idaho to the west, North Dakota and South Dakota to the east, Wyoming to the south, and the Canadian provinces of Alberta, British Columbi ...
, US
**
Summit Lake cirque, and others on
Mount Evans
Mount Evans is the highest peak in the Mount Evans Wilderness in the Front Range of the Rocky Mountains of North America. The prominent 14,271-foot (4,350 m) fourteener is located southwest by south ( bearing 214°) of Idaho Springs in Clear C ...
,
Colorado
Colorado (, other variants) is a state in the Mountain West subregion of the Western United States. It encompasses most of the Southern Rocky Mountains, as well as the northeastern portion of the Colorado Plateau and the western edge of t ...
, US
** Great Basin and others on
Mount Katahdin
Mount Katahdin ( ) is the highest mountain in the U.S. state of Maine at . Named Katahdin, which means "Great Mountain", by the Penobscot Native Americans, it is within Northeast Piscataquis, Piscataquis County, and is the centerpiece of Baxte ...
,
Maine
Maine () is a state in the New England and Northeastern regions of the United States. It borders New Hampshire to the west, the Gulf of Maine to the southeast, and the Canadian provinces of New Brunswick and Quebec to the northeast and north ...
, US
**
Great Gulf
The Great Gulf is a glacial cirque, or amphitheater-like valley head formed from a glacier by erosion, located in the White Mountains of New Hampshire. The cirque's walls are formed, from south to north, by the mountainsides of Mount Washington ( ...
,
New Hampshire
New Hampshire is a U.S. state, state in the New England region of the northeastern United States. It is bordered by Massachusetts to the south, Vermont to the west, Maine and the Gulf of Maine to the east, and the Canadian province of Quebec t ...
, US
**
Tuckerman Ravine
Tuckerman Ravine is a glacial cirque sloping eastward on the southeast face of Mt. Washington, in the White Mountains of New Hampshire. Although it draws hikers throughout the year, and skiers throughout the winter, it is best known for the ma ...
,
New Hampshire
New Hampshire is a U.S. state, state in the New England region of the northeastern United States. It is bordered by Massachusetts to the south, Vermont to the west, Maine and the Gulf of Maine to the east, and the Canadian province of Quebec t ...
, US
See also
*
*
References
Notes
Footnotes
External links
Photographs and case study of corrie glaciers
{{Authority control
Glaciology
Glacial landforms
Oronyms
es:Glaciar#Clasificación