High Quality Content by WIKIPEDIA articles! The Lomonosov Ridge (Russian: Хребет Ломоносова) is an unusual underwater ridge of continental crust in the Arctic Ocean. It spans 1800 km from the New Siberian Islands, as it is part of Eurasia, over the central part of the ocean to Ellesmere Island of the Canadian Arctic Archipelago. The width of the Lomonosov Ridge varies from 60 to 200 km. It rises 3,300 to 3,700 m above the seabed. The minimum depth of the ocean above the ridge is 954 m. Slopes of the ridge are relatively steep, broken up by canyons, and covered with layers of silt.