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A map of the northern Philippine islands with a rhumbline network, a web of lines to aid navigation. Bathymetry (sea depth), shoals and reefs are marked, reinforcing the maritime theme. The compass rose points left, indicating north’s direction.

A mid-17th century hand-drawn map concentrating on the Philippine islands between Luzon and Mindanao. Many are named, and shoals and reefs marked around their coasts. The azimuthal projection of the map focuses at the center of the archipelago.