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Map of Deli on the east coast of Sumatra, dominated by the numerous rivers that flow from the mountains in the southwest to the Strait of Malacca. The railway lines around the city of Medan are shown in red, and flags indicate a military garrison.

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]’.)