This gorge wriggles through the Picos for 11km, with limestone cliffs and mountain slopes rising up to 1, 500m overhead.
Surrounded by red limestone cliffs, the water comes from the ground and is so clean you can drink it.
CNN: Oasis from the ruins: Afghanistan opens first national park
Jackson Hole Whitewater organises half day excursions on the class III Snake River with some big rapids through the limestone cliffs of Snake River Canyon.
Back at Ko Hong, just around the corner from Ao Bo Lae, the otherwise continuous circle of limestone cliffs that surround the island opens up slightly.
Thailand's Phang Nga Bay resembles an alien seascape, where towering limestone cliffs in improbable shapes carve the view into unfamiliar patterns of land, sea and air.
In August Lorenzo Zambrano, the chairman and CEO of Cemex, the world's biggest building-materials supplier, which built its empire out of the limestone cliffs of Monterrey, vented his anger on Twitter.
Mass tourism has been slow to discover Bulgaria's rugged north coast, home to few beaches but a long stretch of triumphant limestone cliffs popular with Bulgarian rock-climbers who leap into the crashing waves below.
Blasted into the limestone cliffs, and at times burrowing through them, is a walking track, the Ruta de Cares, which is said to be one of the busiest trails in Spain with up to 3, 000 hikers each day in summer.
Situated on a remote and otherwise deserted island distinguished by serous limestone cliffs, Lagen has 50 private rooms, including a crescent of eight hip-roofed cottages poised on stilts in an oval of placid water that's the color of molten Coke bottles.
West and south of Siena, and two hours north of Rome, it sweeps from a Tyrrhenian seacoast of limestone cliffs, deserted dunes, and umbrella pines that look like fantasy broccoli forests, across broad plains of olive trees and scented Mediterranean brush, and up to shadowy woodlands and ancient, fortified hill towns.
The 10.5 km trail threads past starkly eroded limestone slopes, rock pinnacles and cliffs pockmarked with caves.
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