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Map of the Mahakam River in Borneo, based on an expedition by the Dutch explorer Dr. Anton Nieuwenhuis in the late 19th century. An inset map shows the upper reaches of the river at twice the scale of the main map.

The route of a late 19th century expedition by Dutch geologists, botanists, ethnographers and zoologists is marked on this map of southwest Borneo. Mountain peaks which were surveyed by the geologists are highlighted with a red circle.

Maritime map of the Philippines, with inset maps of bays showing bathymetry (sea depth), shoals, reefs and anchor points. There is also an inset map of Taal Volcano, and elevations (side views of terrestrial landmarks like mountains and islands).

A navigation map of the Java Sea and Sunda Islands, with bathymetry (sea depth), maritime routes, shoals and reefs, and elevations (side views of terrestrial landmarks). Inset maps feature the bay at Batavia and the straits between the Sunda Islands.

A navigation map of the Java Sea and Sunda Islands, with bathymetry (sea depth), maritime routes, shoals and reefs, and elevations (side views of terrestrial landmarks). Inset maps feature the bay at Batavia and the straits between the Sunda Islands.

A navigation map of the Java Sea and Sunda Islands, with bathymetry (sea depth), maritime routes, shoals and reefs, and elevations (side views of terrestrial landmarks). Inset maps feature the bay at Batavia and the straits between the Sunda Islands.

A navigation map of the Java Sea and Sunda Islands, with bathymetry (sea depth), maritime routes, shoals and reefs, and elevations (side views of terrestrial landmarks). Inset maps feature the bay at Batavia and the straits between the Sunda Islands.

A mid-19th century German map of mainland Southeast Asia showing a mixture of ancient kingdoms (e.g. Birma, Siam, Anam) and the colonial possessions of Britain (Malaya, Straits Settlements) and Denmark (Nicobar Islands).

A mid-19th century German map of mainland Southeast Asia showing a mixture of ancient kingdoms (e.g. Birma, Siam, Anam) and the colonial possessions of Britain (Malaya, Straits Settlements) and Denmark (Nicobar Islands).

Maritime map of the Philippines, with inset maps of bays showing bathymetry (sea depth), shoals, reefs and anchor points. There is also an inset map of Taal Volcano, and elevations (side views of terrestrial landmarks like mountains and islands).

A mid-19th century German map of mainland Southeast Asia showing a mixture of ancient kingdoms (e.g. Birma, Siam, Anam) and the colonial possessions of Britain (Malaya, Straits Settlements) and Denmark (Nicobar Islands).