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The borders on this mid-19th century map of mainland Southeast Asia are colour-coded to show kingdoms, countries and colonial territories. Twelve different scales are shown, as different countries used different measurement systems.

This mid-19th century map of mainland Southeast Asia is divided into regions with colour-coded borders. The Birman Empire/Birmah (Myanmar) is the most detailed, with 10 provinces marked and listed in the map’s legend.

Navigation map of the southern South China Sea, with bathymetry (sea depth), islands, shoals and reefs marked. There are four maritime routes to China marked, with notes on what months or monsoon season to use them. Inset map of Gulf of Thailand.

Navigation map of the southern South China Sea, with bathymetry (sea depth), islands, shoals and reefs marked. There are four maritime routes to China marked, with notes on what months or monsoon season to use them. Inset map of Gulf of Thailand.