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The shaded area on this map is where volcanic ash fell from the 1883 eruption of Krakatoa (Sunda Strait between Sumatra and Java). Red figures record the thickness of the ash in millimetres; black figures are distance from the eruption in kilometres.

Different levels of government monopolies are indicated on this map of the Dutch East Indies by the use of areas of colour (opium trade) and hash marks (salt trade). The inset map of Java is divided into residencies.