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This map of the island of Billiton (Belitung, Indonesia) features mountains, rivers, railways, roads, settlements, coconut plantations and administrative borders. An inset map shows the island’s port and capital city Tanjung Pandan.

A map to aid in the navigation of the rivers leading to Saigon (Ho Chi Minh City, Vietnam). Details include bathymetry (water depth), currents, and a side view (or ‘elevation’) of hills to use as a landmark. Tides are described in written remarks.