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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.