The Gowanus Canal is a canal in the New York City borough of Brooklyn, on the westernmost portion of Long Island. Connected to Gowanus Bay in Upper New York Bay, the canal borders the neighborhoods of Red Hook, Carroll Gardens, and Gowanus, all within South Brooklyn, to the west; Park Slope to the east; Boerum Hill and Cobble Hill to the north; and Sunset Park to the south. It is 1.8 miles (2.9 km) long. There are seven bridges over the canal, carrying Union Street, Carroll Street (a landmark), Third Street, Ninth Street, Hamilton Avenue, the Gowanus Expressway, and the IND Culver Line of the New York City Subway.