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Sashima (猿島郡, Sashima-gun) is a district located in Ibaraki Prefecture, Japan.
As of 2020, the district had an estimated population of 32,294, with a population density of 463,3 persons per km². The total area is 69.70 km². Annual population change between 2015 and 2020 was -0.61%.
Within the district, the Edo river flows into the Tone river.