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An ephemeral pool of water in the granite riverbed of the Agua Fria River Canyon in the Agua Fria National Monument of Arizona.

An ephemeral pool of water in the granite riverbed of the Agua Fria River Canyon in the Agua Fria National Monument of Arizona.

An ephemeral pool of water in the granite riverbed of the Agua Fria River Canyon in the Agua Fria National Monument of Arizona.

Sign marking Badger Springs Road off of I-17 Arizona. This road leads to a hiking trail in the Agua Fria National Monument.

View of Black Canyon on the west side of the Agua Fria National Monument of Arizona with the Bradshaw Mountains in the distance.

Boat trip on the Senanayake Samudraya Lake, Gal Oya National Park, Sri Lanka, Indian subcontinent, South Asia

A snowy winter woodland scene, near Princetown, in the heart of Dartmoor National Park, Devon, Great Britain.

A snowbound brook in the dead of winter, near Moretonhampstead, Dartmoor National Park, Devon, Great Britain.

Cuckmere Haven in the South Downs National Park, East Sussex, England, UK, where the Cuckmere river flows into the English Channel. The chalk cliffs to the East are known as the Seven Sisters.

Cuckmere Haven in the South Downs National Park, East Sussex, England, UK, where the Cuckmere river flows into the English Channel. The chalk cliffs to the East are known as the Seven Sisters.

Cuckmere Haven in the South Downs National Park, East Sussex, England, UK, where the Cuckmere river flows into the English Channel. The chalk cliffs to the East are known as the Seven Sisters.

Sandstone rock formation in the Dixie National Forest, Utah, USA. The National Forest was created in 1906.

Mist covered landscape from Wulao Feng (Five-Old-Man Peak) at Lushan (Mount Lu), UNESCO, Jiujiang City, Jiangxi, China

Mist covered landscape from Wulao Feng (Five-Old-Man Peak) at Lushan (Mount Lu), UNESCO, Jiujiang City, Jiangxi, China

The view of Teide volcano from La Ruleta viewpoint during sunrise, Teide National Park, La Orotava, Santa Cruz de Tenerife, Tenerife, Canary Islands, Macaronesia, Spain, Western Europe

A tourist observes Teide volcano from La Ruleta viewpoint during sunrise, Teide National Park, La Orotava, Santa Cruz de Tenerife, Tenerife, Canary Islands, Macaronesia, Spain, Western Europe

A tourist at Arco de Tajao during sunrise, El Poris de Abona, Santa Cruz de Tenerife, Tenerife, Canary Islands, Macaronesia, Spain, Western Europe

Teide volcano from La Ruleta viewpoint during sunset, Teide National Park, La Orotava, Santa Cruz de Tenerife, Tenerife, Canary Islands, Macaronesia, Spain, Western Europe

A tourist observes Teide volcano from La Ruleta viewpoint during sunset, Teide National Park, La Orotava, Santa Cruz de Tenerife, Tenerife, Canary Islands, Macaronesia, Spain, Western Europe

The beautiful and little-known Kvernufoss waterfall, taken on a sunny winter day, Iceland, Polar Regions