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Navigation map of the waters and straits around some of the islands of the Riau Archipelago, between Sumatra and Batam. Bathymetry (sea depth), current and tide data, reefs, shoals and other obstructions (clay, mud, shells, stones, sand) are marked.

Although mainly a navigation map—with a rhumbline network and elevations of mountains—there are also many terrestrial details shown, such as settlements and mountains. The inset map of Hoeamohel details plantations and the cultivation of nut crops.