Riverside Park is a scenic waterfront public park on the Upper West Side of the borough of Manhattan in New York City, operated and maintained by the New York City Department of Parks and Recreation. The park consists of a narrow 4-mile (6.4 km) strip of land between the Hudson River and the gently curving rise-and-fall of Riverside Drive. When the park was first laid out, access to the river was blocked by the right-of-way of the New York Central Railroad West Side Line; later the railroad track was covered over with an esplanade lined with honey-locusts. Riverside Park also contains part of the Manhattan Waterfront Greenway, which encircles Manhattan's waterfronts with car-free bike routes.