Rhode Island covers an area of only 4,002 sq km (1,545 sq mi), including 461 sq km (178 sq mi) of inland water and 23 sq km (9 sq mi) of coastal water over which it has jurisdiction. Roughly rectangular in shape, its maximum extent east to west is 64 km (40 mi), while the distance from its northern border to the southern edge of Block Island is 98 km (61 mi). The mean elevation is 60 m (200 ft).
Rhode Island lies wholly within the New England province of the Appalachian Region, or Appalachian Highland, and can be divided into two natural regions. In eastern Rhode Island are the lowlands of the Narragansett Basin, which is a part of New England’s Seaboard Lowland. The west forms part of the New England Upland.
The Narragansett Basin occupies the eastern third of Rhode Island and is a low-lying area of sands and clays. Few points in the basin rise to more than 60 m (200 ft) above sea level. Narragansett Bay and its tributary bays cut deeply into the region. To the east of Narragansett Bay are several low ridges of sedimentary rock that rise above the surrounding lowland. West of the bay the land is more gently rolling and there are many small lakes and ponds. To the extent that there is agriculture in Rhode Island, the Narragansett Basin is the state’s chief farming region. The New England Upland occupies the western two-thirds of Rhode Island. It is underlain by granite and other resistant crystalline rocks and rises sharply from about 60 m (about 200 ft) at the edge of the Narragansett Basin.
Jerimoth Hill, 247 m (812 ft) above sea level and the state’s highest point, is located in this region near the Connecticut state line. The surface of the upland is generally rocky. There are some farms and much woodland. "Rhode Island" © Emmanuel BUCHOT, Encarta, Wikipedia
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