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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.

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.

A world map showing winds, hurricanes and typhoons, including trade winds, calms, typhoon, monsoon and hurricane regions in Southeast Asia. An inset map shows the approach of the Rodriguez Hurricane towards Java in 1843.

A world map, including Southeast Asia, showing rainfall information (darker shading indicates greater rainfall). Southeast Asia lies in the ‘Zone of the Periodical Rains’, and is marked with monsoons and ‘Electrical Explosions’.

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.

Coloured borders on this map show the kingdoms of mainland Southeast Asia and the Philippines. Arrows marked on the sea to the west of the Philippines indicate wind direction during the monsoon seasons (with the months marked in French).

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.

Map dedicated to William Cowper, whose coat of arms sits atop the cartouche. It features two horses holding a crest with three martlets (mythical birds used in heraldry). The cartouche also features Asian traders. Monsoons are marked on the map.

The arrows on this map show the direction of the seasonal monsoons: each arrow has a label, indicating the month. The northeast coast of Borneo is labelled ‘A Desart [desert/deserted?] Coast’, while the south is labelled ‘Pepper Country’.

This map is dedicated to William Cowper, whose coat of arms sits atop the cartouche. It features two horses holding a crest with three red martlets (mythical birds used in heraldry). The colourful cartouche also features Asian traders.

French text on the reverse of this map describes the religion, languages, crops, trade etc. of Aracam and Pegu (Myanmar), Siam (Thailand), Cambaja (Cambodia). The map is dedicated to the Dutch merchant Christophoro Thisio.

As was common in this era, this map mistakenly shows the bottom of Peninsula Malaya as a separate island. The map also features illustrations of ships and a sea monster. Text on the reverse describes the people, crops, geography of the region.