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 (not to be confused with the Southern State 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.

The Shore Parkway, Southern Parkway, Laurelton Parkway, and Cross Island Parkway are collectively known as the "Belt System". The four components of the Belt System are designated as New York State Route 907C (NY 907C), NY 907D, NY 907B, and NY 907A, respectively, by the New York State Department of Transportation. All four numbers are reference route designations and are not signed. Excluding the Cross Island Parkway, the other three segments are now known collectively as the official "Belt Parkway". It is designated an east–west route, and its exit numbering system begins, in standard fashion, at the western terminus of the Shore Parkway, the westernmost parkway in the system. The numbering increases as the parkway proceeds eastward, and continues onto the Cross Island at the eastern terminus of the Belt Parkway. The north–south parkway retains the numbering scheme to its northern terminus.

The Belt Parkway begins at an interchange (exit 22) with the Gowanus Expressway in the Bay Ridge section of Brooklyn. Paralleling Third Avenue, the parkway turns west and crosses over the Long Island Rail Road Bay Ridge Branch, a freight-only line. Bypassing Bay Ridge, the Belt passes exit 1, which services 65th–67th Streets in Bay Ridge. Crossing south past Owl's Head Park, the parkway turns southward and enters Shore Road Park, paralleling the shore of the Upper New York Bay. The eastbound lanes of the Belt Parkway pass several small parking areas that serve as viewing spots for the bay. Connections across the parkway to Bay Ridge are also present at these parking areas. Beginning the bend to the southeast, the parkway passes Andrew Lehman Field.

Just east of the field, the Belt Parkway comes within the shadows of the Verrazzano-Narrows Bridge and passes exit 2, which serves as the southern terminus of Fourth Avenue. After crossing under the bridge, the westbound lanes enter exit 3 which connects to the Verrazzano. Eastbound, the lanes from the bridge connecting to the Belt merge in, as the road enters Dyker Beach Park and Golf Course. During a short gap away from the shore, the Belt passes a parking area for Dyker Beach Park, entering exit 4, which services Bay 8th Street and 14th Avenue. Continuing along the park, the Belt begins to parallel Cropsey Avenue and passes another parking area before reaching exit 5, a junction with Bay Parkway. This marks the eastern end of Dyker Beach Park, and the route begins to parallel shoreline strip malls before reaching Calvert Vaux Park.

Now in the Gravesend section of Brooklyn, the Belt passes exit 6, which connects to Cropsey Avenue. Westbound, this junction is split into exit 6N and exit 6S, also serving Stillwell Avenue. The parkway bends eastward and crosses over the Coney Island Complex, a large railroad yard for the New York City Subway. Just before passing exit 7, the eastbound lanes cross just north of the Neptune Avenue subway station. Exit 7 eastbound services Ocean Parkway, which is met by exit 7B proceeding westbound. Westbound, exit 7A services Shell Road in Gravesend. Paralleling the namesake Neptune Avenue, the parkway enters Sheepshead Bay and connections to Coney Island.

At exit 8, the Belt Parkway connects to Coney Island Avenue, approaching the namesake bay as it continues east. Paralleling Emmons Avenue through Sheepshead Bay, the parkway passes exit 9A eastbound, which connects to Knapp Street and exit 9B, which is a ramp to the eastern end of Emmons Avenue. Westbound, exit 9 services Knapp Street. Crossing south of Gerritsen Beach, the parkway passes south of the Plum Beach Channel and passes a small rest area on the eastbound lanes. Turning northeast through the Floyd Bennett Field area, the parkway bends north and passes a service area with gas services in the median. Just north of the service area, the Belt passes exit 11N–S, a cloverleaf interchange which connects to Flatbush Avenue and the Rockaways.

After exit 11N, the Belt Parkway continues east through Floyd Bennett Field, crossing over the Mill Basin Drawbridge into Brooklyn Beach and passes the entrance to the Jamaica Bay Riding Academy, the only business served directly on the parkway. Crossing over another bridge, the parkway enters the Canarsie section of Brooklyn. The parkway, now running northeast, parallels a bicycle path, reaching Canarsie Pier and exit 13, which serves as the southern end of Rockaway Parkway. Crossing over another bridge over Spring Creek, the parkway passes exit 14, which connects to Pennsylvania Avenue in Starrett City. The interchange is adjacent to the former Pennsylvania Avenue Landfill. After crossing another waterway, Hendrix Creek, the Belt passes the former Fountain Avenue Landfill and passes exit 15, a diamond interchange with Erskine Street leading to the Gateway Center shopping complex.

Now crossing over the Old Mill Basin section of Jamaica Bay, the Belt Parkway continues northeast in the borough of Queens, entering exit 17N–S, Cross Bay Boulevard and Cohancy Street, which also connects to the Cross Bay Bridge and towards the Rockaways. Crossing into an interchange with NY 27, the parkway travels under the IND Rockaway Line (A train) and passes exit 18B, which connects to Aqueduct Racetrack in Ozone Park.