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Musfur Sinkhole is the largest known sinkhole cave in Qatar. Cave

Yaren, Nauru: Makwa / Moqua Well - small lake in a cave, once the primary source of drinking water for Nauruans, now used as a cool resting place in the many scorching days of Nauru.

Picture of stalagmites and stalactites inside Phung Chang Cave, Phang Nga, Thailand.

Red sandstones formations into the Foradada cave in the Areny mountain in Mont-Roig, Tarragona, Catalonia, Spain. Textures natural background.

Lava Tubes are collapsing around the Queen's Bath area of Hawaii.

Engelbrecht Cave - South Australia

Stalagmite and cave formation inside a cave or cavern. A stalagmite is a type of rock formation that rises from the floor of a cave due to the accumulation of material deposited on the floor from ceiling drippings. Stalagmites may be composed of lava, minerals, mud, peat, pitch, sand, sinter and amberat.

Inside view of borra cave with colorful lights, Araku Valley, Visakhapatnam Andhra Pradesh, India, March 04 2017

Cave wall stalactites creates an abstract background

Waterfall inside cave near Pokhara city in Nepal

Kaklik Cave in Denizli, Turkey

Gronligrotta karst cave, Norway

Unique underground geology of stalactites and stalagmites.

Stalactites in a karst cave

Karakum Desert north of Darvaza, Dashoguz Province, Turkmenistan: Turquoise crater - a water filled sinkhole in a natural gas field, the result of a collapsed cavern. The water is rich in sulphur. Turkmenistan holds the world's 4th largest natural gas reserves.

White colored underground cavern with rounded off rock formations that were formed by water flowing through.

Horizontal landscape photo of spectacular underground limestone rock formations, lit up by lights, inside the Wombeyan Caves in a reserve in the countryside near Goulburn, NSW.

Mammoth Cave NP - 1999. Scanned from Kodachrome 64 slide.

Extensive system of 150 large & small caves with unique formations & limited light. It is a part of the UNESCO Reserve of Halong Bay.

Formations inside the Gokgol Cave, Zonguldak, Turkey

석회암 동굴의 벽 VD702

Water Cave of the Sierra de Baza - Granada - Spain.

Karakum Desert north of Darvaza; Dashoguz Province; Turkmenistan: Turquoise crater - a water filled sinkhole in a natural gas field; the result of a collapsed cavern now displaying the rock strata. Sulphur smelling crater lagoon in the desert.

Cave with stalactites and stalagmites in the Caucasus Mountains. Huge underground cave.

View from boat of beautiful circle-shape cave in Puglia, South Italy

Stalactite rock formations in En Cave, the third largest cave in the world, is in the heart of the Phong Nha Ke Bang National Park in the Quang Binh province of Central Vietnam

The magical underground environment from picturesque different minerals as limonite dripstones creating stalagmites, stalactites, and stalactite spaghetti.

While such names as Hoa Tien cave, Tien Phi cave, Mai Chau valley, Hoa Binh hydroelectric dam are tourists highlights, Dam Da seem to be an obscure historical site. Dam Da is located in Phu Lao commune, Lac Thuy district, Hoa Binh province.

Cave.

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