Community District 10, commonly known as Central Harlem, is located in Upper Manhattan along with three other community districts. Three of the District’s four major boundaries are natural features: Harlem River to the north, Central Park to the south and the Fordham Cliffs to the west. The District’s eastern border, Fifth Avenue, is its only boundary that is not a natural feature. Central Harlem occupies approximately 1.5 square miles of relatively flat land and is often referred to as “the Valley” by long term residents.