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An isthmus ( /ˈɪsθməs/ or /ˈɪsməs/;[1] plural: isthmuses; from Ancient Greek: ἰσθμός, translit. isthmos, lit. 'neck'[2]) is a narrow piece of land connecting two larger areas across an expanse of water by which they are otherwise separated.[3] A tombolo is an isthmus that consists of a spit or bar, and a strait is the sea counterpart of an isthmus. Canals are often built across isthmuses, where they may be a particularly advantageous shortcut for marine transport. For example, the Panama Canal
Canal
crosses the Isthmus
Isthmus
of Panama, connecting the North Atlantic and Pacific Oceans; the Suez Canal
Canal
connects the Mediterranean Sea and the Red Sea, cutting across the western side of the Isthmus
Isthmus
of Suez, formed by the Sinai Peninsula; and the Crinan Canal
Canal
crosses the isthmus between Loch Crinan
Loch Crinan
and Loch Gilp, which connects the Kintyre peninsula with the rest of Scotland. Another example is the Welland Canal
Canal
in the Niagara Peninsula
Niagara Peninsula
(technically an isthmus). It connects Lake Ontario
Lake Ontario
to Lake Erie. The city of Auckland on the North Island
North Island
in New Zealand
New Zealand
is situated on an isthmus. See also[edit]

Geography portal

Land bridge List of isthmuses List of straits

Notes[edit]

Wikimedia Commons has media related to Isthmi.

^ "Isthmus". Collins English Dictionary. Collins. Retrieved 19 December 2016.  ^ LSJ entry ισθμός ^ "Isthmus". Britannica. Retrieved September 22, 2013. 

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Coastal geography

Landforms

Anchialine pool Archipelago Atoll Avulsion Ayre Barrier island Bay Baymouth bar Bight Bodden Brackish marsh Cape Channel Cliff Coast Coastal plain Coastal waterfall Continental margin Continental shelf Coral reef Cove Dune

cliff-top

Estuary Firth Fjard Fjord Freshwater marsh Fundus Gat Geo Gulf Gut Headland Inlet Intertidal wetland Island Islet Isthmus Lagoon Machair Marine terrace Mega delta Mouth bar Mudflat Natural arch Peninsula Reef Regressive delta Ria River delta Salt marsh Shoal Shore Skerry Sound Spit Stack Strait Strand plain Submarine canyon Tidal island Tidal marsh Tide pool Tied island Tombolo Windwatt

Beaches

Beach
Beach
cusps Beach
Beach
evolution Coastal morphodynamics Beach
Beach
ridge Beachrock Pocket beach Raised beach Recession Shell beach Shingle beach Storm beach Wash margin

Processes

Blowhole Cliffed coast Coastal biogeomorphology Coastal erosion Concordant coastline Current Cuspate foreland Discordant coastline Emergent coastline Feeder bluff Fetch Flat coast Graded shoreline Headlands and bays Ingression coast Large-scale coastal behaviour Longshore drift Marine regression Marine transgression Raised shoreline Rip current Rocky shore Sea cave Sea foam Shoal Steep coast Submergent coastline Surf break Surf zone Surge channel Swash Undertow Volcanic arc Wave-cut platform Wave shoaling Wind wave Wrack zone

Management

Accretion Coastal management Integrated coastal zone management Submersion

Related

Bulkhead line Grain size

boulder clay cobble granule pebble sand shingle silt

Intertidal zone Littoral zone Physical oceanography Region of freshwater influence

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