Hiyama (檜山郡, Hiyama-gun) is a district located in Hiyama Subprefecture, Hokkaido, Japan.
As of 2004, the district has an estimated population of 21,896 and a density of 19.59 persons per km. The total area is 1,117.57 km.
41°25′44″N 140°17′10″E / 41.429°N 140.286°E / 41.429; 140.286
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