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Kuril Islands

The archipelago extends for 750 miles (1,200 km) starting from Kamchatka Peninsula to the Hokkaido Island (Japan). This area includes at least 100 volcanoes, of which 35 are still active, and many hot springs. Vegetation ranges from tundra on the northern islands to dense forest on the larger southern islands. Kurl Island significant occupation is fishing, especially for crab. Large quantities of continental sediment flow into the sea, primarily from the Amur River. Bottom deposits in the Kuril Basin consist of a clay-diatom silt, whereas approaching the shore there are fine, silt-covered sands, coarse sands, and pebbles mixed with mussel shells.