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Map marking the border (in orange) agreed between British and Dutch territory on Borneo in 1891. Alternative borders are shown: according to the Dutch (blue), according to the British North Borneo Society (yellow) and proposed by the British (green).

Map showing the results of an 1884 agreement between the Netherlands and Britain to exchange parts of their colonial territories in New Guinea: the red area was ceded by the Netherlands to Britain; green was ceded by Britain to the Netherlands.

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.

This detailed map of the Dutch East Indies in the mid-19th century contains a great deal of information: topographical details, settlements and administrative areas, roads, railways and maritime routes, telegraph lines, inset maps etc.

On this map of Asia, colours are used to show the colonial territories of the European powers, and to show Muslim and Buddhist regions: Sumatra is divided between the Netherlands and local rulers; the Straits Settlements underlined in red (British).

On this map of Asia, colours are used to show the colonial territories of the European powers, and to show Muslim and Buddhist regions: Sumatra is divided between the Netherlands and local rulers; the Straits Settlements underlined in red (British).

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.

Based on surveys by Sir Stamford Raffles, this German map of Sumatra focuses on the navigation of coasts and straits, with bathymetry (sea depth), anchor points, shoals and reefs marked, including on inset maps of Singapore and the Bangka Strait.

Map of Assam, including India’s border with northwest Birma (Myanmar) where indigenous lands/peoples are marked (Singphos, Naga, Kasi-Schan, Thai-Lung) e.g. ‘These mountainous landscapes are inhabited by the Naga tribes [translation from map text]’.

Map of Assam, including India’s border with northwest Birma (Myanmar) where indigenous lands/peoples are marked (Singphos, Naga, Kasi-Schan, Thai-Lung) e.g. ‘These mountainous landscapes are inhabited by the Naga tribes [translation from map text]’.

Four-sheet map of Asia from Carl Ritter’s book ‘Erdkunde [Geography]’, including the northwest Birman Empire (Myanmar) and featuring rivers, mountains, administrative districts and settlements. Plus a page of elevations of Asian mountain ranges.

Four-sheet map of Asia from Carl Ritter’s book ‘Erdkunde [Geography]’, including the northwest Birman Empire (Myanmar) and featuring rivers, mountains, administrative districts and settlements. Plus a page of elevations of Asian mountain ranges.