The most important Siberian petroleum zones are the West Siberian petroleum basin, Central Urals, Sakhalin Island, Nordvyl on the Arctic Siberian coast, and the Kamchatka peninsula. From the Caspian Sea there is one oil pipeline, which continues to the petrol camps of Emba at Orsk and ends in Omsk, in western Siberia. Sakhalin Island has the most important oil reserves in the Russian Far East. In 1936, the Ohka oil wells extracted about 470,000 tonnes; one-third were obtained for Japanese concessionaires. In the Emba River area about 466,000 tonnes were extracted from about 20 pits of a total of 300 yaciments in 1937.