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The towering cliffs of the Narrows in Zion National Park, Utah, United States of America, North America

View over the canyonlands and the Colorado River from the Dead Horse State Park, Utah, United States of America, North America

Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Sky Walk over the Grand Canyon and Colorado River, UNESCO World Heritage Site, Arizona, United States of America, North America

Half Dome, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Rafters above their boats on the Colorado River through the Grand Canyon, Arizona, United States of America, North America

Night photography at Blacktail Canyon, just before river mile 121, Grand Canyon National Park, Arizona, United States of America, North America

View of Antelope Point, on the left, in Canyon De Chelly from just west of Tseyi Overlook, Arizona, United States of America, North America

Panorama view of the Junction between the north and south forks of Canyon De Chelly National Monument, with Dog Rock rock formation on the far left, Arizona, United States of America, North America

Aerials of Hoodoos along the Milk River, Writing-on-Stone Provincial Park, UNESCO World Heritage Site, Alberta, Canada, North America

Hoodoos along the Milk River, Writing-on-Stone Provincial Park, UNESCO World Heritage Site, Alberta, Canada, North America

Swinging Bridge over Merced River, Cathedral Beach, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Linville River, Blue Ridge Mountains, Appalachia, North Carolina, United States of America, North America

Couple kayaking down the Colorado River, Castle Valley near Moab, Utah, United States of America, North America

Waterfall below Llano de Bozuelo, Rio Caldares hiking trail from Banos de Panticosa, Panticosa, Pyrenees, Huesca Province, Spain, Europe

Sky Walk over the Grand Canyon and Colorado River, UNESCO World Heritage Site, Arizona, United States of America, North America

Meltwater river on Mount Rainier from the Burroughs Mountain Trail, Mount Rainier National Park, Washington State, United States of America, North America

Hikers in Marble Canyon along the Colorado River, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Floating down the Colorado River, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

A view of the upper Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Kirkjufellsfoss Falls, near the port of Grundarfjordur, Snaefellsnes peninsula, western Iceland, Polar Regions

The meanders of the San Juan River viewed at twlight from the overlook in Goosenecks State Park near Mexican Hat, Utah, United States of America, North America

River flowing by Paine Grande mountain in French Valley, Torres del Paine National Park, Patagonia, Chile, South America

The Upper Falls in the Grand Canyon of Yellowstone in the Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

View over the canyonlands and the Colorado River from the Dead Horse State Park, Utah, United States of America, North America

The Colorado River with Castle Valley in the background, near Moab, Utah, United States of America, North America

Cascades on the Mistaya River, Banff National Park, UNESCO World Heritage Site, Alberta, Canada, North America

The Upper Falls in the Grand Canyon of Yellowstone in the Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

View over the cliffs of the Zion National Park and the Angel's Landing path, Zion National Park, Utah, United States of America, North America

Sandstone rocks reflecting in the Colorado River, Canyonlands National Park, Utah, United States of America, North America

Cathedral Rocks from Yosemite Valley, UNESCO World Heritage Site, California, United States of America, North America

West Rim, Grand Canyon and Colorado River, UNESCO World Heritage Site, Arizona, United States of America, North America

Snow melt cascades leading to Taggart Lake, Grand Teton National Park, Wyoming, United States of America, North America

A view of the upper Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Bighorn Lake, Bighorn Canyon National Recreation Area, Wyoming, United States of America, North America

A creek in the snowy vallley with Monte Disgrazia in the background, Malenco Valley, Province of Sondrio, Valtellina, Lombardy, Italy, Europe

Tumalo Falls, a 97-foot waterfall on Tumalo Creek, in the Cascade Range west of Bend, Oregon, United States of America, North America

Commercial oar boat runs the Deubendorff Rapid, just past river mile 132, Grand Canyon National Park, Arizona, United States of America, North America

A view of the Puebloan granaries at Upper Nankoweap, Grand Canyon National Park, Arizona, United States of America, North America

The colourful Grand Canyon of the Yellowstone, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Freshwater stream carving through soft volcanic rocks to reach the sea, Trebarwith Strand, Cornwall, England, United Kingdom, Europe

View over the Lewis River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Hiking to the Puebloan granaries at Upper Nankoweap, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Night photography at South Canyon, just before river mile 32, Grand Canyon National Park, Arizona, United States of America, North America