Mýrdalsjökull Glacier is 595 km2 in area, 1493 m. Glacial tongues creep down from it to the lowlands, the most prominent being Sólheimajökull, close to the Ring Road. Under the south eastern side of the glacier is Katla, an active central volcano with a caldera up to 10 km in diam-eter. On average, Katla has erupted at intervals of 40-80 years, melting the glacial cap and causing catastrophic floods that sweep glacial debris across the entire sands. Some 16 Katla eruptions have been recorded in historical times, but there have probably been 20 in all. The last eruption of Katla was in 1918, but did not cause significant damage.

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