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10 Geological Wonders you didn’t know

The Great Blue Hole-The Great Blue Hole is a large submarine sinkhole off the coast of Belize. It lies near the center of Lighthouse Reef, a small atoll 70 km from the mainland and Belize City. The hole is circular in shape, over 300 m across and 124 m deep.

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13 of the Biggest, Strangest, and Most Devastating Sinkholes on Earth

Terrifying holes that are opening up all over Britain

Swimmers float in the saphirre waters of the Ik-Kil cenote, near the Maya site of Chichén Itzá in Mexico's Yucatán Peninsula. Cenote means "natural well" in Spanish.

The World's Biggest Sinkholes

The 2007 Guatemala City Sinkhole: This sink hole was large enough to swallow up about a dozen homes which fell 330 feet down into the hole.

The mirny diamond mine in russia is the world’s biggest hole - it’s 525 metres deep and 1.25km wide.The suction above the hole resulted in several helicopter crashes, so all flight above the hole is prohibited now.