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Map of the Riouw (Riau) Residency, Sumatra. The border between Riau and the island’s west coast is marked in red ‘as far as it is known [voor zoo verre die... bekend is]’, ending abruptly in the unexplored mountains near Lake Toba, northern Sumatra.

The Dutch East Indies are bordered in red on this mid-19th century map. A maritime postal route from China to Europe, via Singapore and Penang, is shown. Another maritime route, from Batavia to Singapore, is also marked.