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The border between Siam (Thailand) and Tenasserin (Tanintharyi Region, Myanmar) is highlighted on this map, while the more northerly border between Siam and Burma (Myanmar) is marked as being ‘approximate’.

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).

The inset map on this map of India features part of mainland Southeast Asia: Pegu and the Tenasserim Provinces (Myanmar), Siam (Thailand), and the Malay Peninsula (Malaysia), with the Straits Settlements—Singapore, Malacca, Penang—highlighted in red.

The inset map on this map of India features part of mainland Southeast Asia, with the British colonial territories—Straits Settlements, British Burma—highlighted in red, ‘protected states’ in yellow, and ‘independent states’ in green.

The letters ‘E’ or ‘D’ are marked after place names to indicate if they are English or Dutch colonial possessions: e.g. ‘Marleborough Fort E’ on Sumatra or ‘Concordia Fort D’ on Timor. The Philippines are labelled ‘to Spain’.

The letters ‘E’ or ‘D’ are marked after place names to indicate if they are English or Dutch colonial possessions: e.g. ‘Marleborough Fort E’ on Sumatra or ‘Concordia Fort D’ on Timor. The Philippines are labelled ‘to Spain’.

The letters ‘E’ or ‘D’ are marked after place names to indicate if they are English or Dutch colonial possessions: e.g. ‘Marleborough Fort E’ on Sumatra or ‘Concordia Fort D’ on Timor. The Philippines are labelled ‘to Spain’.