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A series of four maps of the Indian Ocean—one for each quarter of the calendar year—showing the direction and intensity of the winds, including around the seas of Southeast Asia. There are extensive explanatory notes.

On this map of India and Southeast Asia, borders are outlined and cities underlined in different colours to show the colonial territories of the European powers. On Borneo, the names of indigenous peoples are listed (‘Dayak’s, Papua’s, Bugi’s’).

On this map of India and Southeast Asia, borders are outlined and cities underlined in different colours to show the colonial territories of the European powers. On Borneo, the names of indigenous peoples are listed (‘Dayak’s, Papua’s, Bugi’s’).

Map from Johannes Olivier’s book ‘Land- en Zeetogten in Nederland's Indie [Land and Sea Journeys in the Dutch Indies]’, showing European colonial possessions and indigenous kingdoms in Asia.

Map from Johannes Olivier’s book ‘Land- en Zeetogten in Nederland's Indie [Land and Sea Journeys in the Dutch Indies]’, showing European colonial possessions and indigenous kingdoms in Asia.

To aid navigation, this map shows small islands, shoals and reefs, maritime routes for use during monsoons or at particular times of the year, bathymetry (sea depth), past explorers’ routes, shipwrecks and text about monsoons, typhoons and currents.

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.

Longitude is indicated in two different ways on this mid-18th century map: along the top border, it is shown in degrees (number of degrees east of London); more unusually, along the bottom border, it is shown in time (number of hours east of London).

A late 18th century map of Asia with regions divided by colour-coded borders, and detailing rivers, mountains, reefs and shoals.

A late 18th century map of Asia published in London by John Bowles, with regions indicated by colour. Central Borneo is labelled ‘Part inhabited by the Biayos’, which is seen on many contemporary maps, often with the comment ‘a savage people’.

Hand-drawn coloured borders have been added to this map to distinguish various regions: mainland Southeast Asia and most of the islands of maritime Southeast Asia are bordered in green, with Borneo and the Philippines in red.