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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).

A brightly-coloured hand-drawn map of the Gulf of Siam, made for a ship’s captain. The elaborate compass roses are the centre of a rhumbline network, a web of lines to aid navigation. Bathymetry (sea depth), islands, shoals and reefs are also marked.