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Map of stream ship trade routes around Southeast Asia. Rivers, railways, submarine telegraph cables, lighthouses (fixed, revolving and flashing), graving docks and coaling stations are marked. An inset map shows a railway route from Britain to Asia.

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]’.)