Shimamaki (島牧郡, Shimamaki-gun) is a district located in Shiribeshi Subprefecture, Hokkaido, Japan.
As of 2004, the district has an estimated population of 2,096 and a density of 4.79 persons per km². The total area is 437.26 km².
Coordinates: 42°37′59″N 140°01′48″E / 42.63306°N 140.03000°E / 42.63306; 140.03000
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