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This late 19th century map shows the disputed border region between Siam (Thailand, Laos) and Tongkin (Vietnam), with the border claimed by Siam highlighted in yellow. Provinces along the border are labelled with the names of their local tribes.

Topographical map of mainland Southeast Asia. Mountains are represented by hachures—short lines/dashes that give a sense of the shape and steepness of terrain—and settlements, roads and rivers are marked.

Southeast Asia is on sheet four of this map. British colonial territory—British Burma, the Straits Settlements, Sarawak, British North Borneo—is highlighted in red, with the Dutch East Indies, Spanish Philippines and Portuguese East Timor also shown.

This map of Asia is from ‘Stieler’s Schul-Atlas’, a version of ‘Stielers Handatlas’ that was used widely in German schools in the 19th century.

This map of Asia is from ‘Stieler’s Schul-Atlas’, a version of ‘Stielers Handatlas’ that was used widely in German schools in the 19th century.

A nautical chart of the Indian Ocean showing bathymetry (sea depth), including in great detail around the seas and straits of Southeast Asia.

Map of the Kingdom of Siam, featuring mountains, rivers and villages, and surrounded by a yellow border (the border with Upper Burma and China in the north is undefined). The southern part of Siam is shown on an inset map of the Malay Peninsula.

On this map of Southeast Asia, numerous small islands, shoals and reefs are marked and named, especially in the South China Sea and around the Sunda and Maluku islands. Submarine cables to carry telegraph messages around the region are also shown.

Map showing the French protectorate territories of mainland Southeast Asia: Annam, Tongking and French Cochin China (modern Vietnam) and Cambodia. Some parts of Siam (Thailand) and Laos are also shown.

Map of East Asia, with British colonial possessions—Burma, Straits Settlements, Labuan and British North Borneo—highlighted with red borders. There is also an inset map of the Red River (Hong River) running through Hanoi, Vietnam.

Two maps, one of which features mainland Southeast Asia: Anam (Tonquin and Cochin China) in red, Lower Cochin China in green, Cambodia in yellow, and Siam in white. An inset map shows maritime routes between Europe and Asia.

Crops are marked on this map of Asia: Sumatra and Java have sugar, coffee, tea; the Lesser Sunda Islands and Maluku Islands have cinnamon, nutmeg and clove; mainland Southeast Asia has sugar and cotton. Arrows on the sea indicate currents.