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This map from 1800 is by the Scottish cartographer Alexander Dalrymple, who was the first Hydrographer of the British Admiralty. It documents the river systems of the Birman Empire (Myanmar) and modern Thailand, Laos, Cambodia and Vietnam.

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).

This map from 1800 is by the Scottish cartographer Alexander Dalrymple, who was the first Hydrographer of the British Admiralty. It documents the river systems of the Birman Empire (Myanmar) and modern Thailand, Laos, Cambodia and Vietnam.

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).

The kingdoms of mid-18th century mainland Southeast Asia are shown on this map: Ava and Pegu (Myanmar), Siam (Thailand), Tonquin and Cochinchine (Vietnam), Camboie (Cambodia) and Laos. Rivers are also prominent, and mountains are shown pictorially.

A mid-18th century map showing mainland Southeast Asia divided into regions such as Pegu, Ava and Aracan (Myanmar), Siam (Thailand), Laos, Camboie (Cambodia), Cochinchine and Tunquin (Vietnam), and Malaca (Malaysia).

This mid-18th century map of Asia has a stereographic projection to aid navigation. An illustration features Asian men—probably merchants, one of whom sits on a throne—and a kneeling elephant.

This mid-18th century map of Asia has a stereographic projection to aid in navigation. There is also an illustration featuring two Asian men depicted as native warriors, with a robed woman, as well as a large lizard.

This mid-18th century map of Asia has a stereographic projection to aid in navigation. There is also an illustration featuring two Asian men depicted as warriors, with a robed woman, as well as a large lizard.

This mid-18th century map of Asia has a stereographic projection to aid navigation. An illustration features Asian men—probably merchants, one of whom sits on a throne—and a kneeling elephant.

This mid-18th century map of Asia has a stereographic projection to aid navigation. An illustration features Asian men—probably merchants, one of whom sits on a throne—and a kneeling elephant.

This mid-18th century map of Asia has a stereographic projection to aid in navigation. There is also an illustration featuring two Asian men depicted as warriors, with a robed woman, as well as a large lizard.