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Delaware, United States (38.69205 -75.40133)
Delaware is on a level plain, with the lowest mean elevation of any state in the nation. Its highest elevation, located at Ebright Azimuth, near Concord High School, is less than 450 feet (140 m) above sea level. The northernmost part of the state is part of the Piedmont Plateau with hills and rolling surfaces. The Atlantic Seaboard fall line approximately follows the Robert Kirkwood Highway between Newark and Wilmington; south of this road is the Atlantic Coastal Plain with flat, sandy, and, in some parts, swampy ground. A ridge about 75 to 80 feet (23 to 24 m) in elevation extends along the western boundary of the state and separates the watersheds that feed Delaware River and Bay to the east and the Chesapeake Bay to the west.
Hockessin, Delaware, New Castle County, Delaware, United States (39.78761 -75.69660)
Coordinates: 39.76150 -75.72502 39.81359 -75.63489 - Minimum elevation: 104 ft - Maximum elevation: 447 ft - Average elevation: 292 ft
Pennsville Township, Wilmington, New Castle County, Delaware, United States (39.63390 -75.51337)
Coordinates: 39.56953 -75.55987 39.69823 -75.46232 - Minimum elevation: -10 ft - Maximum elevation: 89 ft - Average elevation: 10 ft
Henderson Heights, Pike Creek, Delaware, New Castle County, Delaware, 19711:19713, United States (39.71511 -75.70243)
Coordinates: 39.69511 -75.72243 39.73511 -75.68243 - Minimum elevation: 16 ft - Maximum elevation: 384 ft - Average elevation: 164 ft