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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.

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).

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.

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.

Navigation map of the southern part of the South China Sea, including the straits of Malacca and Singapore, and the Riau Archipelago. Bathymetry (sea depth), lighthouses, shoals and other obstructions are marked, with hills to use as landmarks.

A navigation map of the northern tip of Sumatra, featuring bathymetry (sea depth), reefs, shoals, and side views of landmark mountains (elevations). Lighthouses are highlighted in red and yellow, with lines to indicate the limits of their range.

Navigation map of the mouths of the Koealoe (Kualu) and Panei (Barumun and Bila) rivers on the east coast of Sumatra. Large sand and mud banks, bathymetry (sea depth), bouys and currents are marked. On land, tall trees are shown to use as landmarks.

Map of part of the west coast of the Gulf of Papua, with islands, river mouths, shoals, bathymetry (water depth), notes to aid navigation. On land, notes on terrain (‘Limestone Hill’), vegetation (‘Pandanus & Nipa Palms’) and people (‘Paia Tribe’).

Map of the state of Perak (Malay Peninsula) with a table of statistics: area, population, road/railway/river lengths, revenue, tin exports. Gold and tin mines are marked, and the Straits Settlements are highlighted in red.