The following is a list of sinkholes, blue holes, dolines, crown holes, cenotes, and pit caves. A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer. Some are caused by karst processes—for example, the chemical dissolution of carbonate rocks[1] or suffosion processes.[2] Sinkholes can vary in size from 1 to 600 m (3 to 2,000 ft) both in diameter and depth, and vary in form from soil-lined bowls to bedrock-edged chasms. Sinkholes may form gradually or suddenly, and are found worldwide.[3]
2010 Guatemala City sinkhole – a disaster in which an area approximately 20 m (65 ft) across and 90 m (300 ft) deep collapsed, swallowing a three-story factory.
2016 Florence sinkhole – a sinkhole, thought to have been caused by a bursting of a water pipe, opened up a 200 m (660 ft) hole on the Arno River bank.
Sistema Sac Actun – an underwater cave system situated along the Caribbean coast of the Yucatán Peninsula with passages to the north and west of Tulum, Quintana Roo
Bayou Corne sinkhole – created from a collapsed underground salt dome cavern operated by Texas Brine Company and owned by Occidental Petroleum, discovered on August 3, 2012, and 350 nearby residents were advised to evacuate
Lake Peigneur – was originally a shallow freshwater body in Louisiana, until a man-made disaster on November 20, 1980 changed its structure, affecting the surrounding land and making it a brackish water lake
Dean's Blue Hole is the world's second deepest known salt water blue hole with an entrance below the sea level.
Biržai Regional Park – a park in northern Lithuania established in 1992 to preserve a distinctive karst landscape
Blue Hole (Red Sea) – a submarine sinkhole around 94 m (308 feet) deep in east Sinai, a few kilometres north of Dahab, Egypt on the coast of the Red Sea.
2018 Surabaya City sinkhole – a 30 m (98 ft) wide and 15 m (49 ft) deep sinkhole opened up on Gubeng Road in Surabaya, Indonesia during construction work on December 18, 2018.
