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Marengo Cave is a privately owned cave [1] located in Marengo, Indiana. One of only four show caves in Indiana, public tours of the cave have been given since 1883. Tours commenced just days after the cave's discovery by two school children. The cave was designated as a National Natural Landmark in 1984. [2]
Formed in Carboniferous/Permian limestone, the main Sơn Đoòng cave passage is the largest known cave passage in the world by volume – 3.84 × 10 7 m 3 (1.36 × 10 9 cu ft), according to BCRA expedition leader Howard Limbert. It is more than 5 kilometres (3.1 mi) long, 200 metres (660 ft) high and 150 metres (490 ft) wide.
Phong Nha Cave: Unknown 7,729 m (25,358 ft) karst UNESCO World Heritage site; Quang Binh province Sơn Đoòng cave: 150 m (490 ft) 9,000 m (30,000 ft) karst Reputed to be the largest in the world; Quảng Bình Province Tam Cốc-Bích Động: Unknown 125 m (410 ft) karst Complex of three caves; Ninh Binh province Thiên Đường Cave: Unknown
Possible cave entrances on Mars. The pits have been informally named (A) Dena, (B) Chloe, (C) Wendy, (D) Annie, (E) Abby (left) and Nikki, and (F) Jeanne. As of 2007 [update] seven putative cave entrances have been identified in satellite imagery of the planet Mars , all so far located on the flanks of Arsia Mons . [ 53 ]
The British cave explorers was impressed by the beauty of the rock formation inside the cave, they named it "Paradise Cave" (Thiên Đường in Vietnamese). [ 31 ] [ 32 ] Access road and tourist facilities was built by Truong Thinh Group, it was opened up to tourists on 3 September 2010 with a 1.1 km path to see the formations.
Ninh Bình is a province of Vietnam in the Red River Delta region of the northern part of the country. [4] The province is famous for a high density of natural and cultural attractions, including reserved parks in Cúc Phương National Park and Vân Long, grotto caves and rivers in Tràng An, Tam Cốc-Bích Động and Múa Caves, historic monuments in the Hoa Lư ancient capital, Vietnam's ...
The forest cover in the park is of the order of 96.2% of primary forest. In April 2009, a group of cave explorers from the British Caving Association conducted surveys in this park and adjacent areas. The biggest chamber of Sơn Đoòng cave is about 4.5 kilometres (2.8 mi) in length, 140 by 140 metres (460 by 460 ft) in size was discovered. [19]
According to the General Statistics Office of the Government of Vietnam, the population of Cao Bằng province as of 2019 was 530,341 with a density of 79 persons per km 2 over a total land area of 6,700.26 square kilometres (2,586.98 sq mi). It is one of the least populated provinces in the northern midlands and mountain areas of Vietnam. [13]