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A navigation map of the Anambas Islands in the South China Sea, including shoals and reefs, bathymetry (sea depth), anchor points, current and tide information, and two elevation views of the coasts. Obstructions in the water are marked with letters.

Navigation map of the Riau Strait between Batam, Bintan and Rempang (Riau Archipelago). Bathymetry (sea depth), lighthouses, bouys, currents and obstructions are marked. There are side views of islands and mountains (elevations) to use as landmarks.