The Zuidwal volcano is an extinct volcano in the Netherlands at more than 2 km below ground under the Wadden Sea, between Harlingen and Vlieland, just south west of the island Griend. The volcano was last active during the late Jurassic, and has since been covered by about 2,000 metres of sedimentary rock, most of it shale and sandstone from the Cretaceous.
Source: Wikipedia.org
Copyright: Creative Commons 3.0
Friesland, Netherlands
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