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Port Island or Chek Chau (Chinese: 赤洲) is an island of Hong Kong, under the administration of Tai Po District. It is located in Tolo Channel, in the northeastern New Territories. Its name literally means red island; after the sedimentary rocks rich in iron that form this island.
Port Island has been designated as a Site of Special Scientific Interest since 1979.
Coordinates: 22°30′04″N 114°21′32″E / 22.501094°N 114.358975°E