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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).

This title of this map refers to orography (which is shown in the use of hachures, short lines/dashes that give a sense of the shape and steepness of terrain) and hydrography (which is shown in the highlighting of coastal regions, shoals and reefs).