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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.

Two separate maps showing the languages and dialects spoken on the islands of Bangka, and the Riouw (Riau) and Lingga archipelagos, in the late 19th century. On Bangka alone, there are 12 languages or dialects listed.

Two maps featuring many of the islands between the Malay Peninsula, Sumatra and Borneo. In the top map, Batam, Bintan, Lingga and many of the smaller Riau Islands. In the bottom map, Bangka and Belitung on the east coast of Sumatra.