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Late 19th century map of the Makassar Strait between Borneo and Celebes (Sulawesi), with shoals and reefs, bathymetry (sea depth), shipwrecks and other navigation aids marked. On land, mountains, with their heights, and rivers are shown.

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), lighthouses, bouys, currents and obstructions are marked. There are side views of islands and mountains (elevations) 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.

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.

Fifty-seven separate maps of bays, roadsteads—a body of water sheltered from tides/currents—and anchor points around the Lesser Sunda Islands. Landmarks, lighthouses, bathymetry (sea depth), shoals, reefs and other obstructions are marked.

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.

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.

Map of the bay at Bengkoelen (Bengkulu, west coast of Sumatra), with bathymetry (sea depth), islands, shoals and reefs marked. Two lighthouses are shown, with lines to indicate the limits of their range.

Map of the bay at Bengkoelen (Bengkulu, west coast of Sumatra), with bathymetry (sea depth), islands, shoals and reefs marked. Two lighthouses are shown, with lines to indicate the limits of their range.