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Maritime map of the Philippines, with inset maps of bays showing bathymetry (sea depth), shoals, reefs and anchor points. There is also an inset map of Taal Volcano, and elevations (side views of terrestrial landmarks like mountains and islands).

Maritime map of the Philippines, with inset maps of bays showing bathymetry (sea depth), shoals, reefs and anchor points. There is also an inset map of Taal Volcano, and elevations (side views of terrestrial landmarks like mountains and islands).

This early 19th century hand-drawn map of Manila Bay has detailed instructions in Spanish on how to enter the bay, and the port at Cavite. Bathymetry (water depth), the mouths of rivers, and landmark mountains are shown to aid navigation.