Astoria Canyon

Submarine canyon and fan-valley system of the Pacific continental margin, off the coast of Oregon, U.S. The canyon's head is in water about 330 feet (100 m) deep, 11 miles (18 km) west of the mouth of the Columbia River. The canyon crosses the seaward half of the continental shelf in a westerly direction and trends sinuously down to the base of the continental slope and the apex of Astoria