The western bank of the Gowanus Canal hosts a boat launch at Second Street. The Second Street boat launch is located adjacent to a "Sponge Park", which absorbs pollutants from the western bank before they can go into the canal. At Fourth Street, the Fourth Street Basin splits off to the east, while the Gowanus Canal proper turns west. A walkway with seating, built as part of the construction of a Whole Foods Market, is located on the north bank of the 4th Street Basin.