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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’.

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).

Navigation chart of the Sunda Strait, with sea depth, anchor points, shoals and other obstructions. Includes many bays, with four highlighted on inset maps. Partly based on writings of Captain Krusenstern whose 1806 route through the strait is shown.

Navigation chart of the Sunda Strait, with sea depth, anchor points, shoals and other obstructions. Includes many bays, with four highlighted on inset maps. Partly based on writings of Captain Krusenstern whose 1806 route through the strait is shown.

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.

Navigation chart of the Sunda Strait, showing bathymetry (sea depth), shoals and reefs, landmarks, and a rhumbline network. Notes record good anchorages, sources of water and supplies etc. Inset map of the Zutphen Islands off the coast of Sumatra.

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.