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Map highlighting areas of eastern Siam (Thailand) claimed by France. Notes describe Siam’s geography, government, population, military and trade (rice, teak, pepper, bullocks, fish, hides, tin, cardamom, tin), including trading partners by tonnage.

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).

Map of the Penang Strait, including written instructions on how to navigate the strait. On land, areas of cultivation are marked, with a table listing acreage used for each crop. A boundary with Siam based on an 1831 treaty is also shown.