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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 routes of nine expeditions (1830 to 1869) are marked on this map. There are also short notes about trading (e.g. at Oonoung in Burmah: ‘A bazaar, with a great variety of European goods’), and a list of other maps referenced in producing the map.

This map shows the border between the British Empire (modern Bangladesh) and Burmah (Myanmar). Although the Burmah part of the map is mostly blank, there is a reference to ‘Shendoos’ (now known as the Lai people).