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Map of Ara Bay (east coast of Sumatra). Bathymetry (sea depth), tide data, reefs, shoals and other obstructions (clay, mud, shells, stones, sand) are marked. Underwater trenches are shown, with light buoys, and there is an elevation view of the bay.

Map of the mouth of the Langkat River on the east coast of Sumatra. Bathymetry (sea depth), tide data, reefs, shoals and other obstructions (mud, sand) are marked. A series of numbered buoys marks a safe channel to enter the river.

Map of the mouths of the Palembang (Musi) and Banjoe Asin (Banyuasin) rivers, on the east coast of Sumatra. Bathymetry (sea depth), tide data, reefs, shoals and other obstructions (clay, mud, sand) are marked.

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), 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.

Four navigation maps of locations around Banka (Bangka) Island, east of Sumatra. Anchor points, lighthouses, bathymetry (sea depth), shoals and other obstructions and landmarks (hills, buildings, trees) are shown.

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.

Navigation map of the southwest coast of Celebes (Sulawesi), near Makassar. Bathymetry (sea depth), lighthouses (in red and yellow, with circles to show the extent of their range), shoals and other obstructions are marked.

Navigation map of the southern part of the Bangka Strait between Sumatra and Bangka Island. Bathymetry (sea depth), lighthouses, reefs, shoals and other obstructions (clay, coral, mud, stones, sand) are marked.

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).