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A view of Southern China and the Gulf of Tonkin. At the center-right of the image, circled in a black outline, is the island of Hong Kong. Hong Kong sits on the South China Sea, which is mostly under cloud cover in this image. West of the South China Sea is the island of Hainan, seen at bottom-center, which separates the sea from the Gulf of Tonkin to the west. In this image, the Gulf of Tonkin is saturated with what seems to be a mixture of sediment and phytoplankton. Photo courtesy of NASA.