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Produced by the British Admiralty’s Hydrographic Office, this map includes various navigational aids, such as maritime routes, bathymetry (sea depth), tide and current data, and elevations (side views of hills and mountains to use as landmarks).

Southeast Asia is shown on sheets two and three of this 12-sheet map of the Indian and Pacific oceans, including detailed inset maps of the straits of Singapore, Bangka, Gaspar and Sunda, with bathymetry (sea depth), shoals, reefs, anchorages etc.

Map of the Strait of Malacca, with inset maps of a central part of the strait and of the Singapore Strait. Bathymetry (sea depth), shoals and reefs are marked, and there are elevations (side views of hills and mountains to use as landmarks).

Chart of the Singapore Strait, Riau Archipelago and Lingga Islands, marked with bathymetry (sea depth), side views of landmark mountains (elevations), written notes, and islands, shoals and reefs, all to aid navigation.

Chart of the Singapore Strait, Riau Archipelago and Lingga Islands, marked with bathymetry (sea depth), side views of landmark mountains (elevations), written notes, and islands, shoals and reefs, all to aid navigation.

Navigation chart of part of the South China Sea leading to the eastern entrance of the Singapore Strait. Features bathymetry (sea depth), anchor points, shoals and other obstructions, landmark hills, and detailed explanatory notes.

Navigation chart of part of the South China Sea leading to the eastern entrance of the Singapore Strait. Features bathymetry (sea depth), anchor points, shoals and other obstructions, landmark hills, and detailed explanatory notes.

This map of the Straits of Malacca features shoals and reefs, bathymetry (sea depth), drawings of side views of landmark mountains (elevations) and written observations, all designed to aid navigation.

A map of the China Sea between Malaya, Sumatra and Borneo. The numbers indicate sea depth (bathymetry), and there are drawings of the side views of some of the islands (elevations), both used to aid navigation. Some maritime routes are also marked.

Two maps. One features most of the world, but with Borneo, Philippines and most of mainland Southeast Asia missing, though there is an inset map of Penang. The other is a navigation map of the strait at Penang, with bathymetry and elevations.

Hand-drawn map of islands in the Riau Archipelago, with bathymetry (sea depth) marked. It features side views of hills (‘elevations’) to use as landmarks, including ‘Jehore hill’, probably in Johor at the southern tip of the Malay Peninsula.

This mid-18th century maritime map charts the seas between Peninsula Malaysia and Sumatra, including Singapore—named ‘Po. Panjang’—with the old and new Straits of Singapore marked. The numbers indicate sea depth (bathymetry).