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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.

The routes of nine expeditions (1830 to 1869) are marked on this map. There are also short notes about trading (e.g. at Oonoung in Burmah: ‘A bazaar, with a great variety of European goods’), and a list of other maps referenced in producing the map.