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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.

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.