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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.
Grotte de Limousis, Limousis cave, Aude, Occitania
Small waterfall falling over rocks in the Kaklık cave
God's Bridge cave - 15 km north of Vratsa, Bulgaria. It’s a natural phenomenon created as a result of the underground river. Called Lilyashkata bara.
Cave and Basin natural mineral springs path, Banff.
New Athos Cave, Abkhazia, small underground lake
A natural cave in As Catedrais beach, Galicia, Spain
Thermal Spa in a cave, Barlang Furdo in Northern Hungary
Horizontal landscape photo of eroded limestone and marble cave walls reflecting on the still water of an underground stream at the entrance to underground caves nin Wombeyan Karst Nature Reserve, a sanctuary for native flora and fauna species near Goulburn, NSW in Winter.
Tapolca lake cave in Hungary next to lake Balaton nice adventure boating in the cave .
Lagoa, Algarve / Faro district, Portugal: looking down at Benagil Cave and its beach - a dreamlike grotto created by the erosion of the colourful sedimentary rocks by the waters of the Atlantic Ocean, creating a dome with an oculus and several arches, like a cathedral - Algar de Benagil.
Gold mines outdoors in Las Medulas, Spain
Kaklik Cave in Denizli, Turkey
Tourists visiting the spring of Fontaine de Vaucluse, the source of the Sorgue river, with a very low level of water
Old gold mine in the gold fields of Western Australia. In the near from Coolgardie, Goldfields-Eperance region, Western Australia, Australia
Cave with thermal water - natural SPA in Hungary ( Miskolc).
Unique underground geology of stalactites and stalagmites.
The Cueva Palombeira, excavated vertically through the hill that presses against the gorge of La Balouta (in Las M dulas, Le n, Spain), is an artificial tunnel constructed for the evacuation of waste material from the gold mine of Las M dulas. Upon entering a few meters into the cavity, one becomes aware of a tunnel cleanly sculpted into the rock, running along the upper part of the cavern, with vertical walls and an arched ceiling. In contrast, the rest of the cavity is a narrow incision with irregular walls, exposing the structure of an ancient fossilized karst gallery. After the construction of the tunnel during the Roman exploitation period of Las M dulas, the continuous flow of mud and waste materials eroded the initial floor, carrying away the weaker materials that sealed the gallery. These materials consisted of alluvial conglomerates. As a result, the tunnel s exit is located at the highest point of a vast cone of debris that fills the La Balouta ravine and reaches the site of Salas de la Ribera, a locality directly built upon the waste materials from Las M dulas.
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.
Stunning view of coastal rock formations and sea arches in Portimao, Portugal. The rugged cliffs and scattered sea stacks create a dramatic and picturesque seascape.
Grjotagja lava cave, Myvatan area, north of Iceland.
Beautiful in any weather, colorful sandstone cliffs. Beautiful coast of the Baltic Sea with caves. Veczemju klints, Veczemju cliffs in the Baltic Sea, Latvia.
Fault and Geology
Rough rock formation structure of limestone mountain cliff wall.
South African mountainside scenics, Western Cape
inderground cenote in mexico, stones reflecten in the clear water
Aerial view of Sant Gregori (Saint Gregory's) Hermitage dug into red rock at sunset in Falset, El Priorat, Tarragona province, Spain
Cuexcomate, an inactive geyser in Puebla city, mistakenly called 'The Smallest Volcano of the World, Mexico
Uplistsikhe (literally, \
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