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Navigation map of the northwest coast of Sumatra. Bathymetry (sea depth), anchor points, shoals and other obstructions (clay, coral, mud, stones, sand) are marked, with hills and settlements to use as landmarks.

Navigation map of the Riau Strait between Batam, Bintan and Rempang (Riau Archipelago). Bathymetry (sea depth), lighthouses, bouys, currents and obstructions are marked. There are side views of islands and mountains (elevations) to use as landmarks.

Map of Koninginne Baai (Bayur Bay, west coast of Sumatra) used to navigate Emma Haven (now Port of Teluk Bayur). It features bathymetry (sea depth), reefs and shoals, as well as lighthouses, buoys and two elevations (side views) of coastal mountains.

Designed to aid navigation around the southeast coast of Borneo, this map features bathymetry (sea depth), and is marked with shoals, reefs and other hazards. Mountains (with their heights) and other landmarks along the coasts are also marked.

The colonial territories of British North Borneo are shown in pink on this late 19th century map, with Brunei and Sarawak in green, and Dutch colonial territory in yellow. Sea routes around the British Empire are depicted on an inset map.

This late 19th century large-scale (1:30,000) map show just a section of the Siak River, in the Riau province of Sumatra. Bathymetry (water depth) is shown in figures to aid navigation, with various landmarks noted along the river’s banks.