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This map of Southeast Asia features a rhumbline network, a web of lines used to aid navigation. Coastal areas are detailed while interiors are mainly blank, and there are illustrations of sailing ships, reinforcing the maritime focus of this map.

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.