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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.

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.