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Maritime routes had to be adjusted in response to the changing monsoon seasons, as is seen on this late 18th century map of the Indian Ocean. Drawings of the heads of children blowing—called ‘wind-heads’—are used to indicate wind direction.

Map of Asia, with mainland Southeast Asia in red and divided into ancient kingdoms, Sunda Islands in yellow, and the Philippines in grey. Twelve different scales are shown, as different countries used different measurement systems.

Map of Asia, with mainland Southeast Asia in red and divided into ancient kingdoms, Sunda Islands in yellow, and the Philippines in grey. Twelve different scales are shown, as different countries used different measurement systems.

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.

A late 18th century maritime map of Southeast Asia, marked with expedition routes including the return of Captain Cook’s HMS Endeavour from Australia in 1770, and Captain Philip Carteret’s circumnavigation expedition in 1768.

A simple hand-coloured map of Asia, with a cartouche of shell, leaves and plants. It shows that in the late 18th century, the details of New Guinea and Australia (‘Nieuw Holland’) were uncertain.

This map of Asia features four different scales: French, Russian, Turkish and Chinese. Each country had their own measuring system, so this was not uncommon at the time.

A simple hand-coloured map of Asia, with a cartouche of shell, leaves and plants. It shows that in the late 18th century, the details of New Guinea and Australia (‘Nieuw Holland’) were uncertain.

This map of Asia features four different scales: French, Russian, Turkish and Chinese. Each country had their own measuring system, so this was not uncommon at the time.

The arrows on this map mark the direction of the seasonal monsoons experienced in the South China Sea and Philippine Sea during the late 18th century. Each arrow has a label indicating the month.

From the first volume of John Seally’s ‘A Complete Geographical Dictionary’, this map of Asia includes the ancient kingdoms of mainland Southeast Asia, and the Sunda and Molucca islands (‘Molucca or Spice Islands’) of maritime Southeast Asia.

Coloured borders divide this late 18th century map of Asia into empires, kingdoms and regions. Five major rivers that flow south through mainland Southeast Asia are named: Aua, Pegu, Tenasserim, Menan and Camboya.