A female brown bear with cubs fishing on Lake Kronotskoye as part of the South Kamchatka, Russia on Sanctuary, August 13, 2017. (Photo by TASS/Barcroft Images)
The Marble Caves of Patagonia, Chile, are beautiful vibrant blue caverns, partially submerged in the equally stunning turquoise waters of Carrera Lake. The lake itself is on the border of Argentina and Chile, with the caves located on the Chilean side. The caves are comprised of three main caverns: the Chapel (La Capilla), the Cathedral (El Catedral), and the Cave (La Cueva). Visitors to the caves can explore them in a small boat or kayak, but only when Carrera Lake’s waters are calm and gentle. A rare and invaluable natural wonder, the existence of these caves is currently threatened by plans to build five large dams in the area. If you visit these caves, please treat them with the utmost respect and care.
Children hold signs thanking truck drivers hauling rocks to the Lake Oroville Dam after an evacuation was ordered for communities downstream from the dam in Oroville, California, U.S. February 13, 2017. (Photo by Jim Urquhart/Reuters)
A little red flying fox dips a toe in a lake at the mouth of Katherine gorge in the Northern Territory, Nitmiluk national park, Australia on September 20, 2017. (Photo by Glenn Campbell/AAP)
Adventurer Sam Cossman movies towards the huge lava lake wearing a custom built industrial proximity heat suit on December 20, 2014 in Ambrym, Vanuatu. (Photo by Conor Toumarkine/Barcroft Media)
A man covered with mineral-rich mud smiles on a bank of lake Tus in Khakassia region, southwest of the Siberian city of Krasnoyarsk, Russia, July 16, 2016. (Photo by Ilya Naymushin/Reuters)