The Ramble and Lake is a main feature of Central Park in New York City, being part of Frederick Law Olmsted and Calvert Vaux's "Greensward" plan (1857). The Ramble was intended as a woodland walk through highly varied topography, a "wild garden" away from carriage drives and bridle paths, to be wandered in, or to be viewed as a "natural" landscape from the formal lakefront setting of Bethesda Terrace (illustration below) or from rented rowboats on the Lake. The 38-acre (150,000 m²) Ramble embraces the deep coves of the north shore of the Lake, excavated between bands of bedrock; it offers dense naturalistic planting, rocky outcrops of glacially scarred Manhattan bedrock, small open glades and an artificial stream, The Gill, that empties through the Azalea Pond, then down a cascade into the Lake.