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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 plan of Batavia in the early 19th century, with the castle, church, dock yard, timber yard and hospital highlighted on the map’s legend. Also shown is the canal flowing through the city to the port, where the sea depth (‘soundings’) is indicated.