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Map of the Mahakam River in Borneo, based on an expedition by the Dutch explorer Dr. Anton Nieuwenhuis in the late 19th century. An inset map shows the upper reaches of the river at twice the scale of the main map.

Geological map of Java and Madura, showing rock types and the locations of volcanoes. There are two cross sections (elevations) showing the heights of terrain: one of Java; and one from Cambodia to the Indian Ocean, including Borneo and Java.