Question: Which is longest, the Gowanus Canal in New York or the Cumberland and Oxford Canal in Maine?

Context paragraphs:
Gowanus Canal: 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 mi 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.

Cumberland and Oxford Canal: The Cumberland and Oxford Canal was opened in 1832 to connect the largest lakes of southern Maine with the seaport of Portland, Maine.  The canal followed the Presumpscot River from Sebago Lake through the towns of Standish, Windham, Gorham, and Westbrook.  The Canal diverged from the river at Westbrook to reach the navigable Fore River estuary and Portland Harbor.  The canal required 27 locks to reach Sebago Lake at an elevation of 267 ft above sea level.  One additional lock was constructed in the Songo River to provide 5 ft of additional elevation to reach Long Lake from Sebago Lake.  Total navigable distance was approximately 38 mi from Portland to Harrison at the north end of Long Lake.  A proposed extension from Harrison to Bear Pond and Tom Pond in Waterford would have required three more locks on the Bear River, but they were never built.

Bob Zuckerman: Bob Zuckerman (born December 19, 1960) is an American community activist, progressive reformer and former small business owner who has advocated for the cleaning of the Gowanus Canal through environmentally sound strategies, and the creation of new parks along the waterfront.  He is on leave as the Executive Director of the Gowanus Canal Community Development Corporation and Gowanus Canal Conservancy.

Old Stone House (Brooklyn): The Old Stone House is a 1933 reconstruction, using some original materials, of the Vechte–Cortelyou House, which was destroyed in 1897.  The original house was an important part of the 1776 Battle of Long Island during the American Revolutionary War; its reconstruction is on Third Street between Fourth and Fifth Avenues, in the J. J. Byrne Playground of Washington Park, in the Park Slope neighborhood of Brooklyn, New York City.  Gowanus Creek once ran nearby, but today the southeastern branch of the Gowanus Canal ends 1300 feet (400 m) west of the house, near Third Avenue between Third and Sixth Streets.

Red Hook Grain Terminal: The Red Hook Grain Terminal is an abandoned grain elevator in the Red Hook neighborhood of Brooklyn, New York City, adjacent to the mouth of the Gowanus Canal.  It is 12 stories tall, 70 ft wide, and 429 ft long, containing fifty-four 120 ft cement silos.  As the neighborhood's tallest structure, it is highly visible from the elevated Gowanus Expressway and New York City Subway IND Culver Line viaducts over the Gowanus Canal.

Brooklyn Community Board 6: Brooklyn Community Board 6 is a New York City community board that encompasses the Brooklyn neighborhoods of Red Hook, Carroll Gardens, Park Slope, Gowanus, and Cobble Hill.  It is delimited by Upper New York Bay and East River on the west, Atlantic Avenue, Court Street, Fourth Avenue, Warren and Pacific Streets on the north, Prospect Park on the east, as well as by the 15th Street, Hamilton Avenue and the Gowanus Canal on the south.  It approximates the 19th century district of South Brooklyn.

Maine State Route 35: State Route 35 (SR 35) runs the course of western Maine, from Kennebunk to Bethel.  It passes through Oxford, Cumberland and York, Cumberland, and Oxford counties.  It is known in its lower sections for both its unusually windy course as well as its notoriously poor paving, as a result of winter frost heaves.  Its northern section leads to the famous ski resort, Sunday River.  The route crosses the Presumpscot River and a well-preserved section of the Cumberland and Oxford Canal approximately 1 mi west of U.S. Route 302 (US 302) in North Windham.

Gowanus Memorial Artyard: In 1979 Frank Shifreen, a recent art graduate of Pratt Institute, began hosting open-studio party art shows at his Brooklyn, New York studio apartment.  There a variety of local New York artists began to network.  His building, which was a nineteenth-century munitions factory at 230 3rd Street in Gowanus, Brooklyn, had over 9,500 square feet, much of it un-rented.  Shifreen asked his landlord to periodically use the un-rented space.  The building was right next to the extremely polluted Gowanus Canal, was also just two blocks from a five-acre abandoned dump that had been classified as a city-owned "Public Site".  At Smith Street and 5th Street, it was filled with weeds, trash middens, and expired auto bodies.

Smith–Ninth Streets (IND Culver Line): Smith–Ninth Streets is a local station on the IND Culver Line of the New York City Subway.  It is located over the Gowanus Canal between Smith and Ninth Streets in Gowanus, Brooklyn and is served by the F and G trains at all times.

Overflow (magazine): Overflow is a free, print magazine covering the arts and pop culture of the neighborhoods surrounding the Gowanus Canal in South Brooklyn, New York.  Specifically, the magazine covers stories related to "Park Slope, Gowanus, Cobble Hill, Carroll Gardens, Red Hook, and Boerum Hill."

Supporting paragraphs: Gowanus Canal Cumberland and Oxford Canal
Answer: Cumberland and Oxford Canal