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A nautical chart of the Indian Ocean showing bathymetry (sea depth), including in great detail around the seas and straits of Southeast Asia.

This map uses hachures—short lines/dashes that give a sense of the shape and steepness of terrain—to show Java’s mountains. There are also two side views (elevations) of the mountains showing the heights of various road routes across the island.

This map uses hachures—short lines/dashes that give a sense of the shape and steepness of terrain—to show Java’s mountains. There are also two side views (elevations) of the mountains showing the heights of various road routes across the island.

Marine chart of the Pacific Ocean, including Southeast Asia. Small islands, shoals and reefs are marked, and often named, around the seas and straits of the region.