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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]’.)

Map of the South Peninsula of Celebes (Sulawesi). The Spermonde Archipelago in the Makassar Strait is very detailed with islands, shoals, reefs and bathymetry. (From ‘Algemeene Atlas van Nederlandsche Indie [General Atlas of the Dutch East Indies]’.)