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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.

Map of the Dutch colonial administrative region (residency) of Riouw (Riau) focusing on the islands and sea passages, with bathymetry (sea depth) marked. (From ‘Algemeene Atlas van Nederlandsche Indie [General Atlas of the Dutch East Indies]’.)