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A nautical chart of the Indian Ocean showing bathymetry (sea depth), including in great detail around the seas and straits of Southeast Asia.

A page from Abbé Prévost’s ‘Histoire Générale des Voyages’. The top map shows the Bay of Laphao on Timor, while the other drawings are side views (or ‘elevations’) of mountains on the region’s islands to use as landmarks when navigating.