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

Yucca plants on a dune, White Sands National Monument, New Mexico, United States of America, North America

Cascades, American Basin, Uncompahgre National Forest, Colorado, United States of America, North America

Close-up of brink of American Falls, Niagara Falls, New York State, United States of America, North America

Walkway through cold lava in the Craters of the Moon National Park, Idaho, United States of America, North America

Stone wall of the Window section, Arches National Park, Utah, United States of America, North America

View over the sandstone cliffs of the Grand Staircase Escalante National Monument, Utah, United States of America, North America

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

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

Bison calf (Bison bison), Yellowstone National Park, Wyoming, United States of America, North America

Rock formations, Needles District, Canyonlands National Park, Utah, United States of America, North America

Alligator, Anhinga Trail, Everglades National Park, Florida, United States of America, North America

Close-up of the American wild flower, baby blue eyes, in springtime, Santa Barbara Botanical Gardens, Santa Barbara, California, United States of America, North America

Beauty Pool in Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Perfect example of strato-volcano, island cone left by subsidence, Crater Lake, Oregon, United States of America (U.S.A.), North America

Mist rising from the Cataloochee ski area, near Maggie Valley, North Carolina, United States of America (USA), North America

Yellow flowering plants and loop road seen from Inferno cone, Craters of the Moon National Monument, Idaho, United States of America (U.S.A.), North America

Puu O Kila lookout on the Na Pali coast, Kauai, Hawaii, Hawaiian Islands, United States of America (U.S.A.), North America

View from the Alum Cave Bluffs trail in Great Smoky Mountains National Park, UNESCO World Heritage Site, Tennessee, United States of America (U.S.A.), North America

Fall colours in taiga, spruce, willow, dwarf birch and aspen, Susitna Valley, Alaska Range, Alaska, United States of America, North America

Sinkhole Plain, polygonal doline karst, near Mammoth Cave, Kentucky, United States of America, North America

Bee collecting nectar from a spring wild flower, Santa Barbara botanical gardens, Santa Barbara, California, United States of America, North America

Part of the North Unit of Badlands National Park, carved out of the prairies by rapid water erosion of sediments, South Dakota, United States of America, North America

Spectacular coastline with waterfall, Julia Pfeiffer Burns State Park, Big Sur, California, United States of America, North America

Tunnel Log, 275 ft long, which fell in 1937, Sequoiadendron giganteum, Sequoia National Park, California, United States of America, North America

The Pu'u O'o cinder cone, the active vent on the southern flank of the Kilauea volcano, UNESCO World Heritage Site, Big Island, Hawaiian Islands, United States of America, North America

The Pu'u O'o cinder cone, the active vent on the southern flank of the Kilauea volcano, UNESCO World Heritage Site, Big Island, Hawaiian Islands, United States of America, North America

Coastal brown bear, Ursus arctos, Lake Clark National Park, Alaska, United States of America, North America

Sedimentary rocks, clay, colour banded by iron oxides, horizontal Triassic Chinle Clay, Blue Mesa, Painted Desert, Arizona, United States of America, North America

Grand Canyon, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Long-beaked common dolphin (Delphinus capensis) with Zodiac, Isla San Lorenzo, Baja California Sur, Mexico, North America

Long-beaked common dolphin (Delphinus capensis), with Zodiac, Isla San Lorenzo, Baja California Sur, Mexico, North America

The American Falls with the Horseshoe Falls behind, Niagara Falls, New York State, United States of America, North America

Arched bridge in Oriental American garden, Ballingrath Gardens, Mobile, Alabama, United States of America (U.S.A.), North America

Vulcan's Throne, the west rim, above the Colorado River, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America (USA), North America

Sandhill crane (Grus canadensis), Bosque del Apache, Socorro, New Mexico, United States of America, North America

St. Mary Lake and Wild Goose Island, Glacier National Park, Rocky Mountains, Montana, United States of America (USA), North America

Old Faithful Geyser, erupts 60ft every 30 minutes, with pressure of 1000lbs per square foot, Napa Valley, California, United States of America (USA), North America

American alligator (Alligator mississipiensis) with open jaws, Sanibel Island, Florida, United States of America, North America

American bumble bee (Bombus pennsylvanicus) on standing milkvetch (standing milk-vetch) (Astragalus adsurgens), Red Feather Lakes District, Roosevelt National Forest, Colorado, United States of America, North America

California gray whale calf (Eschritius robustus), with tourists in San Ignacio Lagoon, Baja California Sur, Mexico, North America

Castle Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Looking over the Appalachian mountains from the Blue Ridge Parkway in Cherokee Indian Reservation, North Carolina, United States of America (U.S.A.), North America

Bayou in swampland at Jean Lafitte National Historic Park and Preserve, south of New Orleans, Louisiana, United States of America (U.S.A.), North America

Lower Falls of Yellowstone River, 94m high at head of canyon, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

American alligator (Alligator mississipiensis) with open jaws, Sanibel Island, Florida, United States of America, North America

California gray whale calf (Eschritius robustus), half above half below, with tourists, San Ignacio Lagoon, Baja California Sur, Mexico, North America

Second Beach, Olympic National Park, UNESCO World Heritage Site, Washington state, United States of America, North America

Thousands of trees blown down by the 1980 eruption still floating on Spirit Lake north of the mountain, Mount St. Helens National Volcanic Monument, Washington State, United States of America (U.S.A.), North America

View east from Logan Pass, Glacier National Park, Montana, United States of America (U.S.A.), North America

Cypress swamp, Cypress Gardens, near Charleston, South Carolina, United States of America, North America

Lake of the Clouds, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America

Saguaro cactus (Cereus giganteus), Saguaro National Park (West), Tucson, Arizona, United States of America, North America

Sub tropical forest, Hunting Island State Park, South Carolina, United States of America, North America

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

Grand Canyon at sunset, UNESCO World Heritage Site, Arizona, United States of America, North America

American black bear (Ursus americanus) COY (cubs of year), on the road to Mendenhall Glacier, Southeast Alaska, United States of America, North America

Rock formation on the Nambe Chimayo road, Santa Fe, New Mexico, United States of America (U.S.A.), North America

Indian Field Creek, on Colonial Highway, near Williamsburg, Virginia, United States of America (U.S.A.), North America

Dawn breaking over Georgetown Lake at Southern Cross, Rocky Mountains, west Montana, Montana, United States of America (USA), North America

Gullies eroded into the Pierre shales below Loop Road, Sage Creek wilderness, Badlands National Park, South Dakota, United States of America, North America

Winter eruption, Old Faithful geyser, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Desert flora beneath Camelback Mountain, Echo Canyon Recreation Area, Paradise Valley, Phoenix, Arizona, United States of America, North America