Washington Heights is a New York City neighborhood in the northern reaches of the borough of Manhattan. It is named for Fort Washington, a fortification constructed at the highest point on Manhattan island by Continental Army troops during the American Revolutionary War, to defend the area from the British forces. Washington Heights borders Harlem to the South, along 155th street, Inwood to the North along Dyckman Street, the Hudson River to the West and Harlem River to the East. Washington Heights is on the high ridge in Upper Manhattan that rises steeply north of the narrow valley that carries 125th Street to the former ferry landing on the Hudson River that served the village of Manhattanville. Though the neighborhood was once considered to run as far south as 125th Street, modern usage defines the neighborhood as running north from Hamilton Heights at 155th Street to Inwood, topping out just below Dyckman Street. Fifteen blocks from the northern end of Washington Heights, in its Hudson Heights neighborhood near Pinehurst Avenue and 183rd Street in Bennett Park, is a plaque marking Manhattan's highest natural elevation, 265 ft (80.8 m) above sea level, at what was the location of Fort Washington, the Revolutionary War camp of General George Washington and his troops, from whom Washington Heights takes its name.