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A Spanish military map of the northern Philippine island of Luzon, highlighting cable and telegraph lines, and aids to maritime navigation such as bathymetry (sea depth) and tide data. A conversion table for metres, fathoms and feet is also shown.

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.