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Navigation maps of two bays on the southeast coast of Borneo. Anchorages, bathymetry (sea depth), buoys, shoals and other obstructions are shown. There is an inset map of the roadstead—a body of water sheltered from tides/currents—at Balikpapan Bay.

Navigation map of the southern part of the Strait of Malacca. Bathymetry (sea depth), lighthouses (in red and yellow), shoals and other obstructions (clay, coral, mud, rocks, shells, stones, sand) are marked, with hills to use as landmarks.

This map of the Madura Strait between Java and Madura is designed to aid navigation: bathymetry (water depth), lighthouses, shoals and reefs, rocks and mud, anchor points, and landmark mountains are all marked. Text describes the tidal conditions.

Navigation map of the Riau Strait between Batam, Bintan and Rempang (Riau Archipelago). Bathymetry (sea depth), current and tide data, reefs, shoals and other obstructions are marked. A second map features improvements to part of the original map.

Navigation map of the west coast of Celebes (Sulawesi), north of Makassar. Bathymetry (sea depth), shoals and other obstructions are marked, with hills and settlements as landmarks, and elevations (side views of hills) to aid navigation.

Navigation map of the west coast of Celebes (Sulawesi), north of Makassar. Bathymetry (sea depth), lighthouses, shoals and other obstructions are marked, with trees and hills as landmarks, and elevations (side views of hills) to aid navigation.

Navigation map of the west coast of Celebes (Sulawesi), north of Makassar. Bathymetry (sea depth), shoals and other obstructions are marked, with hills and settlements as landmarks, and elevations (side views of hills) to aid navigation.

Five maps of bays of Java, including bathymetry (sea depth), anchor points, coastal hills, tide data, reefs and shoals. Obstructions in the water are marked ‘gr’ (rough), ‘h’ (hard), ‘k’ (clay), ‘kr’ (coral), ‘m’ (mud), ‘st’ (stones), and ‘z’ (sand).

Eight navigation maps from around the south coast of Celebes (Sulawesi). Anchorages, roadsteads (bodies of water sheltered from tides/currents), bathymetry (sea depth), shoals and other obstructions are shown, with hills and settlements as landmarks.

Map of the Kai Islands, in the Banda Sea, designed for navigation: it features bathymetry (sea depth), tide data (arrows), reefs and shoals. Obstructions in the water are marked ‘kr’ (coral), ‘m’ (mud), ‘s’ (shells), ‘st’ (stones), and ‘z’ (sand).

Map marking the border (in orange) agreed between British and Dutch territory on Borneo in 1891. Alternative borders are shown: according to the Dutch (blue), according to the British North Borneo Society (yellow) and proposed by the British (green).

Map marking the border (in orange) agreed between British and Dutch territory on Borneo in 1891. Alternative borders are shown: according to the Dutch (blue), according to the British North Borneo Society (yellow) and proposed by the British (green).