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Drone aerial view of Zahara de la Sierra water reservoir dam with turquoise water and mountains in the background, Andalusia, Spain, Europe

Beaver (Castor canadensis) hauling a log up over its dam, Denali National Park and Preserve, Alaska, United States of America

Front view of the historic Glen Canyon Dam in Page, viewed from the Carl Hayden Museum Overlook, Arizona, United States of America, North America

Penitas Ravine with dam and lake, popular hike in the eastern highlands, Vega de Rio Palmas, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Zahara de la Sierra water reservoir dam with turquoise water and mountains in the background, Andalusia, Spain, Europe

Panorama Landscape of Gobrantes and Guadalhorce water reservoir dam at sunset, Andalusia, Spain, Europe

Lanuza village, abandoned after a dam created Lake Lanuza, now rebuilt, Sallent de Gallego, Pyrenees, Huesca Province, Spain, Europe

Aerial view of the man-made Ord River between Lake Kununurra and a Diversion Dam built in 1972, Kimberley, Western Australia, Australia, Pacific

A view from on top of the the Aswan High Dam looking south along River Nile, Aswan, Egypt, North Africa, Africa

View of the Colorado River from the Glen Canyon Dam Bridge on Highway 89, Arizona, United States of America, North America

Glen Canyon Dam viewed from main overlook just south of dam, Page, Arizona, United States of America, North America

Hoover Dam on the Colorado River forming the border between Arizona and Nevada, United States of America, North America

Glen Canyon Dam viewed from main overlook just south of dam, Page, Arizona, United States of America, North America

Glen Canyon Dam on the Colorado River in northern Arizona with Lake Powell in the background, Arizona, United States of America, North America

Landscape of Lake and mountains in Vilarinho das Furnas Dam in Geres National Park, Norte, Portugal, Europe

Hoover Dam on the Colorado River forming the border between Arizona and Nevada, United States of America, North America

Glen Canyon Dam on the Colorado River in northern Arizona with Lake Powell in the background, Arizona, United States of America, North America

Glen Canyon Dam on the Colorado River in northern Arizona with Lake Powell in the background, Arizona, United States of America, North America

The Clyde Dam on the River Clutha, hydro electric project completed in 1989, Central Otago, South Island, New Zealand, Pacific

Glen Canyon Dam, concrete arch 180m high, 475m long, retaining Lake Powell on the Colorado River, Arizona, United States of America, North America

Band-I-Zulfiqar the main lake, Band-E- Amir (Bandi-Amir) (Dam of the King) crater lakes, Afghanistan's first National Park, Bamian province, Afghanistan, Asia

Chhatra Sagar reservoir and luxury tented camp oasis in the desert at Nimaj, Rajasthan, Northern India

Chhatra Sagar reservoir and luxury tented camp oasis in the desert at Nimaj, Rajasthan, Northern India

Depth sign shows 175 metres, the proposed water level when Three Gorges dam project is completed, China

Depth sign shows 175 metres, the proposed water level when Three Gorges dam project is completed, China

Mankwe Dam, central lake in the Pilanesberg National Park, North West Province, South Africa, Africa

Eye Film Museum and A'dam tower in Amsterdam Noord (North), Amsterdam, North Holland, The Netherlands, Europe

Chhatra Sagar reservoir and luxury tented camp oasis in the desert at Nimaj, Rajasthan, Northern India

Chhatra Sagar reservoir and luxury tented camp oasis in the desert at Nimaj, Rajasthan, Northern India

The Hartbeespoort Dam bypass channel in South Africa's North West Province. The water is green due to algae.

The Hartbeespoort dam in South Africa's North West Province. The water is green due to algae growth.

Lake Isabella near Bakersfield, East of California's Central valley is at less than 13% capacity following the four year long devastating drought. The reservoir has dropped so low, that the water level is below the outflow pipe.

Valley of the River Claerwen in the Cambrian Mountains, where reservoir provides water supply for Birmingham, Wales, United Kingdom, Europe

The Hartbeespoort dam in South Africa's North West Province. The water is green due to algae growth.

Nurek, Khatlon Province, Tajikistan. August 12, 2021. Powerhouse and electrical lines on the Nurek Dam, on the Kyzylsu River. Editorial Use Only

The Driekloof Dam which straddles the border between South Africa's KwaZulu Natal Province and Free State Province.

Guthega Dam supplying the water to power Guthega power station as part of the Snowy Mountains hydro scheme, New South Wales, Australia, Pacific

Guthega Dam supplying the water to power Guthega power station as part of the Snowy Mountains hydro scheme, New South Wales, Australia, Pacific

White willow (Salix alba) tree with base of trunk almost chewed through by Eurasian beaver (Castor fiber), Narew marshes, Podlaskie, Poland. MORE INFO: Beaver activity is crucial in keeping Poland's ancient marshes open and free of encroaching bushes and trees and their dams also help to maintain high water levels.

Rainbow in the spray from the overspill from the Karahnjukar dam and Halslon reservoir, North East Iceland, Iceland, Polar Regions

Guthega Dam supplying the water to power Guthega power station as part of the Snowy Mountains hydro scheme, New South Wales, Australia, Pacific

Rainbow and man by from the overspill from the Karahnjukar dam and Halslon reservoir, North East Iceland, Iceland, Polar Regions

A water turbine on the dam at Lake Emerson on the French Swiss border to generate hydro electricity, France, Europe

A water turbine on the dam at Lake Emerson on the French Swiss border to generate hydro electricity, France, Europe

A family of river otters (Lontra canadensis) foraging in the Yellowstone River in Hayden Valley in Yellowstone National Park, Wyoming

Coedty dam which supplies the water to power Dolgarrog Hydro electric power station, North Wales, United Kingdom, Europe

A family of river otters (Lontra canadensis) foraging in the Yellowstone River in Hayden Valley in Yellowstone National Park, Wyoming

Eurasian beaver (Castor fiber) dam on drainage channel in Narew marshes, Podlaskie, Poland. MORE INFO: Beaver activity benefits much other wetland wildlife by helping to maintain high water levels in Poland's ancient marshes and swamp forests.

A family of river otters (Lontra canadensis) foraging in the Yellowstone River in Hayden Valley in Yellowstone National Park, Wyoming

Overspill from the Karahnjukar dam and Halslon reservoir, North East Iceland, Iceland, Polar Regions

Lake Hume, the largest reservoir in Australia, at under 20% capacity after severe drought, Australia, Pacific