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The United States Treasury Department produced this map of trade routes crossing the Pacific Ocean between the United States and Asia. Each route is labelled with the names of its ports, and with the distance between them in miles.

Two maritime routes—for use during the North-east and ‘fair’ monsoons—are shown on this late 19th century navigation map. The routes lead north through Southeast Asia, passing the Philippines, and ending in Hong Kong. Bathymetry (sea depth) is shown.

Produced in Spain, this mid-19th century map details the islands of Visayas, Mindanao and Palawan in the Philippines archipelago. Bathymetry (sea depth) is marked around the islands and on four detailed inset maps of ports in the region.

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.