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The cliff rim of Keyhole Sink in the Kaibab National Forest near Williams Arizona. This sink is an open ended sinkhole where water can flow out of it.

A scuba diver ascends into the light emanating above through the sink hole into the clear freshwaters of Devil's Den cave near Williston, Florida.

An old gate to the sinkhole called the Keyhole Sink in Williams Arizona within the Kaibab National Forest.

The cliff wall of the Keyhole Sink in the Kaibab National Forest near Williams Arizona. This sink is an open ended sinkhole where water can flow out of it.

Trailhead for a sinkhole called the Keyhole Sink in Williams Arizona within the Kaibab National Forest.

The cliff rim of Keyhole Sink in the Kaibab National Forest near Williams Arizona. This sink is an open ended sinkhole where water can flow out of it.

Men washing the starch or dye out of cotton cloth in running water, before drying ready for indigo dyeing, Bhuj district, Gujarat, India, Asia

Men washing the starch out of cotton cloth in running water, before drying ready for indigo dyeing, Bhuj district, Gujarat, India, Asia

A still pond in Keyhole Sink in the Kaibab National Forest near Williams Arizona. This sink is an open ended sinkhole where water can flow out of it.

The cliff wall of the Keyhole Sink in the Kaibab National Forest near Williams Arizona. This sink is an open ended sinkhole where water can flow out of it.

A small flooded sink hole in the Salar de Atacama, Los Flamencos National Reserve, Chile, South America

The evening sun sinks between a triple-monolith in the sandstone cliffs and pinnacles at Monument Valley, Arizona, United States of America, North America

Pink finished plaster walls and hand beaten brass bathroom sink, residential home, Amber, near Jaipur, Rajasthan state, India, Asia

Detail of brass hand beaten bathroom sink in bathroom area of a residence, Amber, near Jaipur, Rajasthan state, India, Asia

Communal laundry in the southeast of the island, near Las Hayas, La Gomera, Canary Islands, Spain, Atlantic, Europe

Looking towards King bank head from Culter Fell above Biggar in the Southern Uplands of Scotland, UK. These peat covered moorland hills are an important carbon sink.

Peat Hags on king bank head above Biggar in the Southern Uplands of Scotland, UK. These peat covered moorland hills are an important carbon sink.

A raised bog being harvested for peat near Douglas water in the Southern Uplands of Scotland. Raised bogs re rare threatened habitats and important carbon sinks that should not be exploited.

A disgustingly dirty bathroom in an abandoned council house in Carlisle, Cumbria, England, United Kingdom, Europe

Snorkelers on the surface of a blue hole. Virgin Blue Hole dive site, Palau, Micronesia, Pacific Ocean. More info: Blue holes such as this are submerged limestone sink holes.

A young mum at a council house on the sink estate of Raffles, Carlisle, Cumbria, England, United Kingdom, Europe

A twenty ton ice explorer truck owned and run by Arngrimur Hermannsson ( Arni), next to a sink hole for meltwater (moulin), Langjokull ice cap, Iceland, Polar Regions

Large group of anthias, chromis and bogue over shipwreck Hellespont, Malta, Maltese Islands, Mediterranean

A twenty ton ice explorer truck owned and run by Arngrimur Hermannsson ( Arni), next to a sink hole for meltwater (moulin), Langjokull ice cap, Iceland, Polar Regions