Hokkaido is the second largest main island of Japan, and the largest and northernmost prefecture. he Tsugaru Strait separates Hokkaido from Honshu. It was formerly known as Ezo, The two islands are connected by the undersea railway Seikan Tunnel. The largest city on Hokkaido is its capital, Sapporo, which is also its only ordinace-designated city. About 43 kilometres north of Hokkaido lies Sakhalin Island and to the east and northeast are the Kuril Islands, which are administered by Russia.
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