The Belt Parkway is the name given to a series of controlled-access parkways that form a belt-like circle around the New York City boroughs of Brooklyn and Queens. The Belt Parkway comprises three of the four parkways in what is known as the Belt System: the Shore Parkway, the Southern Parkway, and the Laurelton Parkway. The three parkways in the Belt Parkway are a combined 25.29 miles (40.70 km) in length. The Cross Island Parkway makes up the fourth parkway in the system, but is signed separately.