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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. Dead Sea sinkholes; Dean's Blue Hole – the world's second deepest known salt water blue hole with an entrance below the sea level; in the Bahamas
Shaanxi tiankeng cluster, discovered in 2016, it is one of the largest in the world comprising forty-nine sinkholes and more than fifty funnels ranging from 50–100 metres in diameter. South China Karst, World Heritage Site; Stone Forest; Xiaozhai Tiankeng, also known as the Heavenly Pit, is the world's largest sinkhole. [3]
The Xiaozhai Tiankeng has been well known to local people since ancient times. Xiaozhai is the name of an abandoned village nearby and literally means "little village", and "Tiankeng" means Heavenly Pit, a unique regional name for sinkholes in China. A 2,800-step staircase has been constructed in order to facilitate tourism. [2]
Three counties in Florida's Tampa area make up a region sometimes called "sinkhole alley" because of the over 20,000 sinkholes there, almost 75% of the sinkholes in the whole state, according to ...
An elevation map of Grassy Cove in Cumberland County, Tennessee. Grassy Cove is North America's largest sinkhole. Sinkhole dimensions: [6] Watershed Area: 33.1770 km 2 (12.8097 sq mi) Watershed Perimeter: 42.1524 km (26.1923 mi) Sinkhole Area: 13.3112 km 2 (5.1395 sq mi) Sinkhole Perimeter: 35.7192 km (22.1949 mi) Sinkhole Depth: 39.97 m (131.1 ft)
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Over the past 15 years, sinkhole damage costs an average of $300 million a year in the United States. There are several ways to identify a sinkhole in progress.
The cave, part of the Mill Cave System, drains Grassy Cove, which is the largest sinkhole in North America. It contains numerous instances of Mississippian era Native American cave art. The entrance is 125 feet by 150 feet. [1] The cave stream forms the nearby Head of Sequatchie spring, the source of the Sequatchie River. [2]