Yamakoshi-gun (Hokkaidō)

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Location of Yamakoshi County in southwest Hokkaidō.

Yamakoshi ( Japanese 山 越 郡 , - gun ) is a district of the Japanese sub-prefecture of Oshima , Hokkaidō Prefecture . The population of the 310.76 km² area amounts to 5329 (as of September 30, 2019), the population density accordingly to 17 inhabitants per square kilometer.

At the administrative level, only the city of Oshamambe is subordinate to Yamakoshi County .