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A map of the effects of the 1883 Krakatoa volcanic eruption. The red line is the boundary of the collapsed area. Black numbers are sea depth before the eruption; red numbers are after. A line above a number means no ground found at that depth.

A map showing the results of the 1883 eruption of the Krakatoa volcano. Black numbers indicate sea depth before the eruption; red numbers are after.

Nine maps of the effects of the 1883 Krakatoa volcanic eruption, including on Rakata Island itself, and Calmeyer Island (formed by the eruption). Other maps use brown shading to show the flooding of nearby islands and settlements by ensuing tsunamis.

A map of the effects of the 1883 Krakatoa volcanic eruption. The orange line is the islands’ outline pre-eruption; the red line is the boundary of the collapsed area. Red numbers are sea depth. Pre- and post-eruption sizes of the islands are listed.

Map of Asia spread over nine sheets, for use in schools. Place names are not printed on the map itself, but are represented by initials and numbers (presumably, there is a legend that lists the names, but it is not present).

Map of Asia spread over nine sheets, for use in schools. Place names are not printed on the map itself, but are represented by initials and numbers (presumably, there is a legend that lists the names, but it is not present).

By Belgian geographer Philippe Vandermaelen (1795–1869), this 19th century map of the Malay Peninsula also features the Riau Islands—including the Anambas and Natuna islands in the South China Sea—the Straits of Malacca and the Singapore Strait.