The 10.5 km trail threads past starkly eroded limestone slopes, rock pinnacles and cliffs pockmarked with caves.
BBC: On the trail in Sardinia
He was describing the multitude of caves that puncture the limestone slopes that spread across Asturias, Cantabria and Castilla y Leon regions in northern Spain.
BBC: Spain��s mountains made of cheese
This gorge wriggles through the Picos for 11km, with limestone cliffs and mountain slopes rising up to 1, 500m overhead.
Close up, its slopes reveal stripes of vines, limestone terraces and olive groves.
BBC: Sailing in Croatia
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