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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 Indian Ocean showing the currents (represented by arrows), including during the North East and North West monsoons. Numbers on the arrows indicate the current’s speed.

Map of the Indian Ocean showing maritime routes, including some to and around Southeast Asia, where they pass through the Strait of Malacca, the Sunda Strait, and the straits between the Lesser Sunda Islands.

Chart of the Indian Ocean, showing climate and weather-related data, including around the seas and straits of Southeast Asia where trade routes are marked, along with monsoon and typhoon regions, and currents during the different monsoon seasons.

Southeast Asia is shown on sheets two and three of this 12-sheet map of the Indian and Pacific oceans, including detailed inset maps of the straits of Singapore, Bangka, Gaspar and Sunda, with bathymetry (sea depth), shoals, reefs, anchorages etc.

Coloured borders identify the colonial possessions of Britain, the Netherlands, Spain, Denmark and Portugal in mid-19th century Southeast Asia. Cities are marked with symbols indicating population, and military forts are marked with star symbols.

Coloured borders identify the colonial possessions of Britain, the Netherlands, Spain, Denmark and Portugal in mid-19th century Southeast Asia. Cities are marked with symbols indicating population, and military forts are marked with star symbols.

Published by the English cartographer John Cary (c.1754–1835), this map is marked with the routes taken from Europe to Asia by the British Royal Navy captains James Cook, John Gore, and George Vancouver, as well as the French explorer Lapérouse.

Map focusing on the passages between the islands of maritime Southeast Asia. Many 18th century routes are labelled with the ship/captain’s name and date, and there are notes on some shoals and reefs recording names, details and incidents/shipwrecks.

Map focusing on the passages between the islands of maritime Southeast Asia. Many 18th century routes are labelled with the ship/captain’s name and date, and there are notes on some shoals and reefs recording names, details and incidents/shipwrecks.

The arrows on this map show the direction of the seasonal monsoons of Southeast Asia during the late 18th century. Each arrow has a label in French, indicating the month. The hatched sea areas are where the winds always blow in the same direction.

On this late 18th century map, the modern nation states of mainland Southeast Asia can be seen emerging: Myanmar (here labelled Ava), Laos, Vietnam (Tong-King and Cochinchine), Cambodia (Camboge), Thailand (Siam) and Malaysia (Malaca).