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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.

Based on surveys by Sir Stamford Raffles, this German map of Sumatra focuses on the navigation of coasts and straits, with bathymetry (sea depth), anchor points, shoals and reefs marked, including on inset maps of Singapore and the Bangka Strait.