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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).

The border of the Tenasserim Division of British Burma (Tanintharyi Region, Myanmar) is highlighted in orange on this set of six map sheets, showing the boundary with Siam (Thailand) to the east, and the islands off the west coast.

Eleven separate maps of bays and river mouths of Sumatra, including two bays on the island on Bras (Breueh Island), and the bay at Kota Radja (Banda Aceh). Bathymetry (sea depth), anchor points, reefs and shoals are marked, along with tide data.

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.

Navigation map of the Riau Roadstead (off west coast of Bintan, Riau Archipelago): a body of water sheltered from tides/currents, for ships to anchor. Bathymetry (sea depth) and various obstructions and landmarks (hills, buildings, trees) are shown.

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).

Three maps on one sheet of the Fly River in British New Guinea, from the mouth to where it meets the Palmer River. Bathymetry (water depth) and sandbanks are marked at the mouth and landmarks—hills, vegetation, villages—are noted along the length.

Navigation map of the mouth of the Padang Tikar River, on the west coast of Borneo, featuring bathymetric (water depth) routes. Obstructions are marked with letters: ‘m’ (mud), ‘z’ (sand). Trees, hills and fishermen’s houses are shown as landmarks.

Navigation map of the mouth of the Padang Tikar River, on the west coast of Borneo, featuring bathymetric (water depth) routes. Obstructions are marked with letters: ‘m’ (mud), ‘z’ (sand). Trees, hills and fishermen’s houses are shown as landmarks.

Designed to aid navigation around the western Java Sea, this map features bathymetry (sea depth), current and tide data, and is marked with shoals, reefs and other hazards. Written notes add details at specific locations (e.g. ‘heavy tide rips’).