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Jacob's Well, a karstic spring and waterhole in the Texas Hill Country flowing from the bed of Cypress Creek near Austin, Texas, USA.
Bimmah Sinkhole, Oman
Cliffs aerials view of natural pools in Caleta de Fuste, a beautiful oasis with emerald clear waters in Fuerteventura island
A man contemplates the blue water well in a rural area, marveling at its depth and the tranquility it emanates, connecting with nature.\nBlue Well of Covanera, Burgos, Spain
The Angus Tower sinkhole in the karst topography in Wood Buffalo National Park in Canada's Northwest Territories
View of smoke from volcano erupting at Bromo Tengger Semeru National Park during bright sunny sunrise on East Java, Indonesia
Aerial view of the Little Blue Lake in Mount Gambier, Australia, with clear blue water surrounded by rocky terrain
Karakum Desert north of Darvaza, Dashoguz Province, Turkmenistan: looking down the Turquoise crater - a water filled sinkhole in a natural gas field, the result of a collapsed cavern. Turkmenistan holds the world's 4th largest natural gas reserves.
Montezuma Well is part of Montezuma Castle National Monument in Arizona, USA. Ancient cliff dwelling is visible on the left side of the photograph.
Colorful thermal pool in Yellowstone National park
Pisina (Piscina) is a natural, rocky pool located in Ano Koufonissi. It is a famous tourist spot, much loved by tourists and locals alike.
Boiling mud pool at Hverir Geothermal Area in North Iceland
Drone aerial view of landscape in Covao dos Conchos in Serra da Estrela, Portugal
coral lagoon hole. huge hole in the coral rocks at the northern coastline in malta island, europe.
Monitor Valley, Nevada, United States – November 23, 2018: Diana's Punchbowl, also called the Devil's Cauldron, is a large crater in central Nevada with a geothermal hot spring at the bottom.
One of the Muji Volcanos, Taxkorgan, Xinjiang Uyghur Autonomous Region, China.
The Crveno Jezero is a collapse doline (collapse sinkhole) containing a karst lake close to Imotski, Croatia. It is 530 metres deep, thus it is the largest collapse doline in Europe.
Giola lagoon on the island of Thassos, \ntear of Aphrodite, eye of Zeus.
Colorful abstract apocalyptic landscape like moonscape of Dallol Lake in Crater of Dallol Volcano, Danakil Depression, Afar Triangle Ethiopia
Breathtaking Gjáin Valley of Waterfalls in the beautiful and unique island nation of Iceland in Europe.
Sacred pond of water that grows naturally It is blue like the sea. Found some places in Thailand
The image is taken in beautiful Hormuz Island, an Iranian island in Persian Gulf, Hormozgan Province. Hormuz Island is a dome-shaped salty island located in the Strait of Hormuz. The island is arid, covered by sedimentary rock and layers of volcanic material, and the mountains are beautifully colourful.
Clouds and Sky Reflected in a Desert Pool in Canyonlands National Park in Utah
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 became a lagoon. Turkmenistan holds the world's 4th largest natural gas reserves.
From Herfoel in Hvaler, Norway, with the famous pothole called «The Cathedral» or «The Whale’s Mouth»
coral lagoon grotta, maltese islands.
Bektau Ata - a mountainous area in the middle of the Kazakhstan steppe, within a radius of about 5-7 km
Close up of one open termite Hill, as they called it - the Poor-man's Cement - as local people use it at building their mud houses. Madagascar
Red Lake (Croatian: Crveno jezero) is a collapse doline (collapse sinkhole) containing a karst lake close to Imotski, Croatia. It is 530 metres deep, thus it is the largest collapse doline in Europe.
Scenic view of valley surrounded by mountains against sky, Mount Roraima, Roraima, Bolivar State, Venezuela.
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