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Data marked The World Factbook or TWF covers 198 countries and 55 territories, from the book published by the Central Intelligence Agency. In addition to coastline lengths, this is the source of the land area used to calculate the "coast/area ratio" for both TWF and WRI (see below) coastline measurement.
A marine coastal ecosystem is a marine ecosystem which occurs where the land meets the ocean. Worldwide there is about 620,000 kilometres (390,000 mi) of coastline. Coastal habitats extend to the margins of the continental shelves, occupying about 7 percent of the ocean surface area.
The Coastal Hazard Wheel system published by UNEP for global coastal management. More and more of the world's people live in coastal regions. [26] According to a United Nations atlas, 44% of all people live within 150 km (93 mi) of the sea. [6] Many major cities are on or near good harbors and have port facilities.
The data for method 2 is from a list maintained by the Office of Ocean and Coastal Resource Management of NOAA. [note 1] The state coastline lengths were computed by an unspecified method that includes tidal areas not included in the first method. [3] These numbers also include the Great Lakes coastlines, which do not have similar tidal areas.
Coastal geography is the study of the constantly changing region between the ocean and the land, incorporating both the physical geography (i.e. coastal geomorphology, climatology and oceanography) and the human geography (sociology and history) of the coast.
The place name East Coast derives from the idea that the contiguous 48 states are defined by two major coastlines, one at the western edge and one on the eastern edge. Other terms for referring to this area include the Eastern Seaboard, which is another term for coastline, [3] Atlantic Coast, and Atlantic Seaboard because the coastline lies along the Atlantic Ocean.
The West Coast of the continental United States makes up part of the Pacific Ring of Fire, an area of heavy tectonic and volcanic activity that is the source of 90% of the world's earthquakes. [28] The American Northwest sees the highest concentration of active volcanoes in the United States, in Washington , Oregon and northern California along ...
The Gulf of Mexico and 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, western Tennessee and Kentucky, extreme southern Illinois, the Missouri Bootheel, eastern and southern Arkansas ...