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A geological map of western Borneo made by a mine engineer, showing the types of soil, coal, clay, and rock (limestone, sandstone, granite, basalt), as well as gold, diamonds, tin, copper and iron found along the rivers.

This late 19th century map of Southeast Asia shows the best maritime routes around the region, according to the time of year. There are also inset maps highlighting the rivers and southern islands of Singapore, and the sea depth around Labuan Island.