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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.

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.

This map of Java uses hachures: short lines/dashes that give a sense of the shape and steepness of terrain. The coast is marked with shoals and reefs (dotted lines and crosses), bathymetry (sea depth, in figures) and anchor points (anchor symbols).

Chart of maritime Southeast Asia, showing bathymetry (sea depth), islands, shoals, reefs, landmarks, and notes (‘Rock seen at Low Water’), all to aid navigation. A rhumbline network has been drawn on the map in pencil. Only one sheet is present.

Chart of maritime Southeast Asia, showing bathymetry (sea depth), islands, shoals, reefs, landmarks, and notes (‘Rock seen at Low Water’), all to aid navigation. A rhumbline network has been drawn on the map in pencil. Only one sheet is present.

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).

Colourful map of the East Indies focusing on maritime navigation: there is a compass rose at the centre of a rhumbline network (a web of lines to help plot routes). Shoals, reefs and islands are also marked.

Colourful map of the East Indies focusing on maritime navigation: there is a compass rose at the centre of a rhumbline network (a web of lines to help plot routes). Shoals, reefs and islands are also marked.

Sumatra and the Malay Peninsula feature on this map of the Indian Ocean. Enganno Island, west of southern Sumatra, has a label that translates as ‘inhabited by very pernicious savages’. An inset map depicts the Madura Strait between Java and Madura.

The cartouche on this map of Asia is decorated with a colourful painting illustrating the region’s commerce, with Asian merchants displaying an assortment of goods, including jewellery, porcelain vessels and figurines, textiles and exotic animals.

Dotted lines and colours divide maritime Southeast Asia into three regions on this map: the Philippine archipelago, Maluku Islands and Sunda Islands. The cartouche features cherub mermaids carrying a banner and shield.