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Southeast Asia is on sheet four of this map. British colonial territory—British Burma, the Straits Settlements, Sarawak, Brunei, British North Borneo—is highlighted in red, with Dutch, Spanish, French and Portuguese territory also shown.

Navigation map of the southern part of the South China Sea, including the straits of Malacca and Singapore, and the Riau Archipelago. Bathymetry (sea depth), lighthouses, shoals and other obstructions are marked, with hills to use as landmarks.

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 waters and straits around some of the islands of the Riau Archipelago, between Sumatra and Batam. Bathymetry (sea depth), current and tide data, reefs, shoals and other obstructions (clay, mud, shells, stones, sand) are marked.