The Delaware Aqueduct is the newest of the New York City aqueducts. It takes water from the Rondout Reservoir through the Chelsea Pump Station, the West Branch Reservoir, and the Kensico Reservoir, ending at the Hillview Reservoir in Yonkers, New York. This feed forms the bulk of New York City's drinking water supply. It was constructed between 1939 and 1945, and carries approximately half of NYC's 1.3 billion US gallons per day water demand. The Delaware Aqueduct leaks up to 35 million gallons per day. At 137 km (85 miles) long and 4.11 meters (13.5 ft) wide the Delaware Aqueduct is the world's longest continuous underground tunnel. (Wikipedia.org.)
The world's longest canal tunnel is the Rove Tunnel in France. The Stad Ship Tunnel in Norway is shorter, wider, and deeper.
The Brooklyn-Battery Tunnel is in New York City and at 9,117 feet (2,779 m) is the longest underwater tunnel in North America.
The world's longest railroad tunnel is the Seikan Tunnel, it is 33.49 miles long.
The longest rock tunnel in the world is located in the New York City.
World's longest tunnel situated in New York state, United States named Delaware Aqueduct tunnel
The world's longest canal that is also a tunnel is the Rove tunnel located in France. It was built in 1974. The longest tunnel in the world is a railroad tunnel that is 35 miles long through the Swiss Alps.
The Seikan Tunnel is in japan. it is one of the longest in the world.
The longest road tunnel in the world at 24.51 km (15.23 miles) long, is known as the Lærdal Tunnel and is located in Norway!
Jawahar tunnel in j&k india
24,5km
The Eisenhower Tunnel is the longest vehicular tunnel.
The Kellerman Tunnel, exact details are ABOVE EYES ONLY>.