Sicily -223-foot deep lava canyon – a narrow, scenically spectacular gorge carved out of the rock by a fast-flowing stream.Extremely intense geological and geothermal events have determined the structure of today’s basalt layers. It seems that in prehistoric times, a river flowed over clay sediments; then huge volcanic eruptions channelled fluid magma into the river bed, which sank in the more clayey sections, creating the current basalt colonnades.Â
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