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A coastal plain is flat, low-lying land adjacent to a sea coast. A
fall line A fall line (or fall zone) is the area where an upland region and a coastal plain meet and is typically prominent where rivers cross it, with resulting rapids or waterfalls. The uplands are relatively hard crystalline basement rock, and the coa ...
commonly marks the border between a coastal plain and a piedmont area. Some of the largest coastal plains are in
Alaska Alaska ( ; russian: Аляска, Alyaska; ale, Alax̂sxax̂; ; ems, Alas'kaaq; Yup'ik: ''Alaskaq''; tli, Anáaski) is a state located in the Western United States on the northwest extremity of North America. A semi-exclave of the U ...
and the southeastern
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country Continental United States, primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., ...
. The
Gulf Coastal Plain The Gulf Coastal Plain extends around the Gulf of Mexico in the Southern United States and eastern Mexico. This coastal plain reaches from the Florida Panhandle, southwest Georgia, the southern two-thirds of Alabama, over most of Mississippi, wes ...
of North America extends northwards from the
Gulf of Mexico The Gulf of Mexico ( es, Golfo de México) is an ocean basin and a marginal sea of the Atlantic Ocean, largely surrounded by the North American continent. It is bounded on the northeast, north and northwest by the Gulf Coast of the United ...
along the Lower
Mississippi River The Mississippi River is the List of longest rivers of the United States (by main stem), second-longest river and chief river of the second-largest Drainage system (geomorphology), drainage system in North America, second only to the Hudson B ...
to the
Ohio River The Ohio River is a long river in the United States. It is located at the boundary of the Midwestern and Southern United States, flowing southwesterly from western Pennsylvania to its mouth on the Mississippi River at the southern tip of ...
, which is a distance of about . The
Atlantic Coastal Plain The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . It covers approximately 20% of Earth's surface and about 29% of its water surface area. It is known to separate the " Old World" of Africa, Europe a ...
runs from the
New York Bight The New York Bight is the geological identification applied to a roughly triangular indentation, regarded as a bight, along the Atlantic coast of the United States that extends northeasterly from Cape May Inlet in New Jersey to Montauk Point o ...
to Florida. The Coastal Plains of
India India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area, the List of countries and dependencies by population, second-most populous ...
lie on either side of the
Deccan Plateau The large Deccan Plateau in southern India is located between the Western Ghats and the Eastern Ghats, and is loosely defined as the peninsular region between these ranges that is south of the Narmada river. To the north, it is bounded by th ...
, along the western and eastern coasts of India. They extend for about 6,150 km from the
Rann of Kutch The Rann of Kutch (alternately spelled as Kuchchh) is a large area of salt marshes that span the border between India and Pakistan. It is located in Gujarat (primarily the Kutch district), India, and in Sindh, Pakistan. It is divided into ...
in the west to
West Bengal West Bengal (, Bengali: ''Poshchim Bongo'', , abbr. WB) is a state in the eastern portion of India. It is situated along the Bay of Bengal, along with a population of over 91 million inhabitants within an area of . West Bengal is the fou ...
in the east. They are broadly divided into the
Western Coastal Plains The Western Coastal Plains is a strip of coastal plain 50 kilometres (31 mi) in width between the west coast of India and the Western Ghats hills, which starts near the south of the Tapi River. The plains are located between the Western Ghats ...
and the
Eastern Coastal Plains The Eastern Coastal Plains is a wide stretch of landmass of India, lying between the Eastern Ghats and the Bay of Bengal. It is wider and leveled than the Western Coastal Plains and stretches from Tamil Nadu in the south to West Bengal in the n ...
. The two coastal plains meet at
Kanyakumari Kanniyakumari (; , referring to Devi Kanya Kumari), also known as Cape Comorin, is a city in Kanniyakumari district in the state of Tamil Nadu, India. It is the southern tip of the Indian subcontinent and the southernmost city in mainland Ind ...
, the southernmost tip of the Indian mainland. The eastern coastal plain is located between The Bay of Bengal and the eastern Ghats and the western coastal plain is located between the Arabian Sea and the western Ghats.


See also

*
Alluvial plain An alluvial plain is a largely flat landform created by the deposition of sediment over a long period of time by one or more rivers coming from highland regions, from which alluvial soil forms. A floodplain is part of the process, being the smal ...
*
Atlantic Plain The Atlantic Plain is one of eight distinct United States physiographic regions. The Atlantic Coast of the United States comprises the coastal states of Delaware, Florida, Georgia, Maine, Maryland, New Jersey, New York, North Carolina, Sou ...
*
Coastal plains of Chile The coastal plains of Chile ( es, Planicies litorales) are a series of discontinuous coastal plains found over much of Chile. Together with the Chilean Coast Range, the Chilean Central Valley and the Andes proper the coastal plains are one of the ...
*
Cumberland Plain The Cumberland Plain, an IBRA biogeographic region, is a relatively flat region lying to the west of Sydney CBD in New South Wales, Australia. Cumberland Basin is the preferred physiographic and geological term for the low-lying plain of the P ...
, Australia *
Israeli coastal plain Israeli coastal plain ( he, מישור החוף, ''Mishor HaḤof'') is the coastal plain along Israel's Mediterranean Sea coast, extending north to south. It is a geographical region defined morphologically by the sea, in terms of topography a ...
* Mississippi embayment *
North European Plain The North European Plain (german: Norddeutsches Tiefland – North German Plain; ; pl, Nizina Środkowoeuropejska – Central European Plain; da, Nordeuropæiske Lavland and nl, Noord-Europese Laagvlakte ; French : ''Plaine d'Europe du Nord ...


References

{{topography-stub Slope landforms Coastal and oceanic landforms