Avola lakes, high angle view, Avola, Noto Valley, Sicily, Italy

Windmills at Kinderdijk at dawn, near Rotterdam, Holland, The Netherlands

Windmills at Kinderdijk, near Rotterdam, Holland, The Netherlands

Windmills at Kinderdijk, near Rotterdam, Holland, The Netherlands

Waterfall view during fall (autumn) season, Tuscany, Italy, Europe

Aerial view of the Santa Cruz River around El Calafate, Patagonia, Argentina, South America

A view of the Mitchell River meandering towards Swift Bay as seen from a commercial helicopter, Kimberley, Western Australia, Australia, Pacific

Xanil River, Arroyo Agua Azul, Chiapas State, Mexico

Vjosa River, near Tepelen, Albania, Europe

Looking down on the deep blue Katsura River, in the autumnal forests in Arashiyama of Kyoto, Honshu, Japan, Asia

Telescope at scenic view of river in city, Paris, Ile de France, France

Caucasian woman standing waist deep in water

Pensive Caucasian woman sitting at edge of water

Caucasian woman standing waist deep in water

Caucasian woman standing waist deep in water smoking cigarette

Caucasian woman leaning on bridge over urban canal

Empty gondola sailing on Venice canal, Veneto, Italy

Mixed Race man running in canal

Sidewalk cafe overlooking Venice Burano canal, Veneto, Italy

Caucasian gondolier admiring Venice cityscape, Veneto, Italy

Serious Caucasian woman standing at urban waterfront

Caucasian woman swimming in pond near rural house

Caucasian woman swimming in pond near rural house

Caucasian woman swimming in pond near rural house

Caucasian woman swimming in pond near rural house

Caucasian woman swimming in pond

Sandy sediments in low tide in a river close to the sea. Isla, Cantabria, Spain, Europe.

Waterfall in a beechwood. Portillo de la Sia Pass. Cantabria, Spain, Europe.

Sandy sediments in low tide in a river close to the sea. Isla, Cantabria, Spain, Europe.

waterfall in Huzmeana creek. Saja-Besaya Natural Park. Cantabria, Spain, Europe.

waterfall. Vada, Vega de Liebana village, County of Liebana, Cantabria, Spain.

Waterfall in a beechwood. Portillo de la Sia Pass. Cantabria, Spain, Europe.

Waterfall in a beechwood. Portillo de la Sia Pass. Cantabria, Spain, Europe.

Rowboat going across the lakes and canals at Schoch's Garden, Kleines Walloch watercourse and the Venus Temple, Dessau-Woerlitz Garden Realm, UNESCO World Heritage Site, Dessau, Saxony-Anhalt, Germany

Hikers on narrow footpath along a Levada watercourse, rainforest in fog, Caldeirao Verde, Queimadas, Madeira, Portugal, Europe

Tree stump of beaver felled tree with beaver damage or gnawing marks at the watercourse edge, Fulda, Hesse, Germany, Europe

Beaver damage or gnaw marks on a tree in a small forest near a watercourse, Fulda, Hesse, Germany, Europe

Tree stump of beaver felled tree with beaver damage or gnawing marks at the watercourse edge, Fulda, Hesse, Germany, Europe

Wave in the Atlantic Ozean, Fuerteventura, Canry Island, Spain

Rainbow over Zambesi River, Victoria Falls, Zimbawe.

Beaver damage or gnaw marks on a tree in a small forest near a watercourse, Fulda, Hesse, Germany, Europe

Morning fog at Yellowstone Lake, Yellowstone National Park, Wyoming, USA, United States of America

Barrage of an old canal

Morning fog, Yellowstone National Park, Wyoming, USA, United States of America

High angle view of clear blue water, Bermuda

High angle view of bogs in Edinburgh, Scotland

Aerial photograph of a dry watercourse in the hills of Lahav in the northern Negev, Israel

Buildings and pedestrian bridge over urban canal, Ljubljana, Central Slovenia, Slovenia

Buildings and pedestrian bridge over urban canal, Ljubljana, Central Slovenia, Slovenia

Buildings along canal in Venice, Italy, Venice, Italy

R?o Tinto, Andalucia, Spain *** Local Caption *** R?o Tinto ("Red River") is very acidic (Ph 2) and has a deep reddish hue due to iron dissolved in water. The acidity of the watercourse is linked to the drainage of pyrite, which is very present in the subsoil. Extremophilic and endemic bacteria and algae colonize the river bed, forming a fragile biofilm that evokes the hot springs of Yellowstone Park in the USA.

R?o Tinto, Andalucia, Spain *** Local Caption *** R?o Tinto ("Red River") is very acidic (Ph 2) and has a deep reddish hue due to iron dissolved in water. The acidity of the watercourse is linked to the drainage of pyrite, which is very present in the subsoil. Extremophilic and endemic bacteria and algae colonize the river bed, forming a fragile biofilm that evokes the hot springs of Yellowstone Park in the USA.

Reflections on Rio Tinto, near its source, Andalusia, Spain *** Local Caption *** R?o Tinto ("Red River") is very acidic (Ph 2) and has a deep reddish hue due to iron dissolved in water. The acidity of the watercourse is linked to the drainage of pyrite, which is very present in the subsoil. Extremophilic and endemic bacteria and algae colonize the river bed, forming a fragile biofilm that evokes the hot springs of Yellowstone Park in the USA.

Clay loaded with iron oxides and dried out, Rio Tinto, Andalusia, Spain *** Local Caption *** R?o Tinto ("Red River") is very acidic (Ph 2) and has a deep reddish hue due to iron dissolved in water. The acidity of the watercourse is linked to the drainage of pyrite, which is very present in the subsoil. Extremophilic and endemic bacteria and algae colonize the river bed, forming a fragile biofilm that evokes the hot springs of Yellowstone Park in the USA.