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Map of part of Southeast Asia, featuring a maritime route from the Sunda Strait to the ports of Bantam (Banten) and Batavia (Jakarta) on Java, and then up through the Gulf of Thailand to the Kingdom of Siam. The return route is also marked.

This 18th century map was designed to aid navigation through the Strait of Malacca between Sumatra and the Malay Peninsula. Shoals, reefs and islands are marked, and the numbers printed on the strait record sea depth (bathymetry).

Hand-drawn map of the Singapore Strait, with Singapore above (green coastline) and the Riau Archipelago below. Bathymetry (sea depth), shoals and reefs are marked. Two mountains at the eastern end of the strait are shown in profile as landmarks.