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Produced by the British Admiralty’s Hydrographic Office, this map includes various navigational aids, such as maritime routes, bathymetry (sea depth), tide and current data, and elevations (side views of hills and mountains to use as landmarks).

Regional borders are colour-coded on this mid-19th century map of mainland Southeast Asia, with British colonial territory in red (including part of the Burman Empire, the Straits Settlements, and Sarawak on Borneo).

Regional borders are colour-coded on this mid-19th century map of mainland Southeast Asia, with British colonial territory in red (including part of the Burman Empire, the Straits Settlements, and Sarawak on Borneo).