The Atlantic coastal plain is a physiographic region of low relief along the East Coast of the United States. It extends 2,200 miles (3,500 km) from the New York Bight southward to a Georgia/Florida section of the Eastern Continental Divide, which demarcates the plain from the ACF River Basin in the Gulf Coastal Plain to the west. The province is bordered on the west by the Atlantic Seaboard fall line and the Piedmont plateau, to the east by the Atlantic Ocean, and to the south by the Floridian province. The Outer Lands archipelagic region forms the insular northeasternmost extension of the Atlantic coastal plain.

The province's average elevation is less than 900 meters above sea level and extends some 50 to 100 kilometers inland from the ocean. The coastal plain is generally wet, including many rivers, marsh, and swampland. It is composed primarily of sedimentary rock and unlithified sediments and is primarily used for agriculture. The area is subdivided into the Embayed and Sea Island physiographic provinces, as well as the Mid-Atlantic and South Atlantic coastal plains.

A coastal plain is an area of flat, low-lying land adjacent to a seacoast. The Coastal Plain is the first region of America.One of the world's largest coastal plains is located in eastern South America. The Gulf Coastal Plain of North America extends northwards from the Gulf of Mexico along the Lower Mississippi River to the Ohio River, which is a distance of about 500 miles (800 km).

During the Cretaceous period, the central area of the United States was covered by a shallow sea, the Western Interior Seaway, which disappeared as the land rose. Large fossilized aquatic birds called Hesperrnis and Ichthyornis, found in western Kansas, indicate that the shallow sea was rife with fish.

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The Israeli coastal plain (Hebrew: מישור החוף‎, Mishor HaḤof) is the narrow coastal plain along Israel's Mediterranean Sea coast. The plain extends 187 kilometres (116 mi) north to south and is divided into a number of areas; the Plain of Zebulun (north of Haifa), Hof HaCarmel (from Haifa to Mount Carmel), the Sharon plain (from Mount Carmel to Tel Aviv), and the Plain of Judea (from Tel Aviv to Zikim). For its duration, the plain has sandy beaches and a Mediterranean climate.

Physical geography

The area was historically fertile in Biblical times, some of it being continually farmed ever since, although much turned over time into swampland, having to be converted back by Zionist pioneers. Today, the area is the center of the country's citrus farms, and contains some of the country's most successful agricultural settlements. The plain has soils made of two sorts of thick river deposits; one dark and heavy - ideal for growing field crops, and the other thin and sandy - ideal for growing citrus fruits.

The Tidewater region of Virginia is the eastern portion of the Commonwealth of Virginia. The term tidewater may be correctly applied to all portions of any area, including Virginia, where the water level is affected by the tides (more specifically, where the water level rises when the tide comes in). In the case of Virginia, the tidewater region includes the land east of the Fall Line, the natural border with the Piedmont Region. It includes Hampton Roads, the rest of the Virginia Peninsula, the Middle Peninsula, the Northern Neck, and the Eastern Shore.

Planters in the early American colonies extended their tobacco productions above the "fall line," where waterfalls or rapids mark the end of the Tidewater and the beginning of the foothill region known as the Piedmont.

Tidewater is host to flora commonly associated with the South Atlantic pine forests and lower Southeast Coastal Plain maritime flora, the latter found primarily in southeastern Virginia.