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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.

This map by Athanasius Kircher shows the ‘hydrophylacium’ of Asia, a mythical subterranean ocean that Kircher thought fed rivers and caused tides. Illustrations of Neptune, the god of the sea, and cherubs playing in water continue the aquatic theme.