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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’.

Topographical map of mainland Southeast Asia. Mountains are represented by hachures—short lines/dashes that give a sense of the shape and steepness of terrain—and settlements, roads and rivers are marked.

Map of the Kingdom of Siam, featuring mountains, rivers and villages, and surrounded by a yellow border (the border with Upper Burma and China in the north is undefined). The southern part of Siam is shown on an inset map of the Malay Peninsula.

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).

A map of Siam (Thailand) and parts of Burma (Myanmar), Cambodia and Laos, focusing on the river networks, and the mountain ranges which are represented by hachures: short lines/dashes that give a sense of the shape and steepness of terrain.

This map of mainland Southeast Asia has colour-coded borders: Burmah (Myanmar) in red, Siam (Thailand) in brown, and Anam (Vietnam) in green. The British territory of Penang is also bordered in red. Independent areas are bordered in grey.

To aid navigation, this map shows small islands, shoals and reefs, maritime routes for use during monsoons or at particular times of the year, bathymetry (sea depth), tide information, shipwrecks, compass roses and landmark mountains at the coasts.

A sketch of the river networks discharging into the Gulf of Siam (Gulf of Thailand), derived from the observations of mid-19th century American missionaries. Settlements along the rivers are noted, as are areas where sugarcane was grown.

Southeast Asia is shown on sheets two and three of this 12-sheet map of the Indian and Pacific oceans, including detailed inset maps of the straits of Singapore, Bangka, Gaspar and Sunda, with bathymetry (sea depth), shoals, reefs, anchorages etc.

On this map of Southeast Asia, British colonial territory is highlighted within red borders: the Straits Settlements (Singapore, Malacca and Penang) on the west coast of the Malay Peninsula; and British Burma (Chittagong and Aracan, and Tenasserim).

From ‘Lizars' Edinburgh Geographical General Atlas’, this mid-19th century map was based on an earlier map by the English cartographer John Cary. It highlights the mountain ranges and rivers of Southeast Asia, and also features many place names.

Although this mid-19th century map covers all of mainland Southeast Asia, the Burman Empire (Myanmar) is shown in greater detail, especially its districts, rivers and place names. It was produced by the James Wyld, geographer to Queen Victoria.