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The strait is about 150 km wide, as measured from the east coast of the island of Belitung to the west coast of Borneo (Kalimantan). Belitung is separated from Bangka Island to the west by the much narrower Gaspar Strait. Bangka lies close to the east coast of Sumatra, separated from it by the Bangka Strait. The Karimata Islands lie in the eastern part of the Karimata strait, northeast of Belitung and off-shore from the west coast of Borneo.