Morningside Park is a 30-acre (12-hectare) public park in Upper Manhattan in New York City, New York, United States. The park is bounded by 110th Street to the south, 123rd Street to the north, Morningside Avenue to the east, and Morningside Drive to the west. A cliff made of Manhattan schist runs through the park and separates Morningside Heights, above the cliff to the west, from Harlem. The park includes other rock outcroppings, a human-made ornamental pond and waterfall; three sculptures; several athletic fields; playgrounds; and an arboretum. Morningside Park is operated by the New York City Department of Parks and Recreation, although the group Friends of Morningside Park helps maintain it.