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West Indian manatee (Trichechus manatus), with snorkeler near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize
West Indian manatee (Trichechus manatus), on the reef near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize
West Indian manatee (Trichechus manatus), with snorkelers near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize
West Indian manatee (Trichechus manatus), with snorkeler near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize
Green sea turtle (Chelonia mydas), feeding on the sand near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize
Underwater view of of the reef system at Half Moon Caye, UNESCO, Mesoamerican Barrier Reef, Belize
Sign warning against feeding sharks, Half Moon Caye, Mesoamerican Barrier Reef, Belize
A myriad of fish and coral underwater at Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize
A myriad of fish and coral underwater at Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize
A myriad of fish and coral underwater at Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize
Soft corals and sponges underwater on Long Caye in the Mesoamerican Barrier Reef, Belize
Brassy chubs (Kyphosus vaigiensis), being fed by boat operators inside the Mesoamerican Barrier Reef, Belize
An adult anole from the Genus Anolis, Half Moon Caye, inside the Mesoamerican Barrier Reef, Belize
A beautiful coral reef, dominated by colorful gorgonians, grows along the edge of the Blue Hole in Lighthouse Reef in the Caribbean Sea. This reef is part of the massive Mesoamerican Reef System, the second largest barrier reef on Earth.
A beautiful coral reef, dominated by colorful gorgonians, grows along the edge of Turneffe Atoll in the Caribbean Sea. This reef is part of the massive Mesoamerican Reef System, the second largest barrier reef on Earth.
A colorful West Indian starfish, Oreaster reticulatus, crawls over a shallow, sandy seafloor in Turneffe Atoll in the Caribbean Sea. This reef is part of the massive Mesoamerican Reef System, the second largest barrier reef on Earth.
Boundary gate and cattle-proof fence between Coconino National Forest and Wet Beaver Creek Wilderness, Arizona, United States of America
Horse-eye jacks (Caranx latus), schooling in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize
Nurse sharks (Ginglymostoma cirratum), being fed in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize
Nurse sharks (Ginglymostoma cirratum), being fed in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize
Nurse sharks (Ginglymostoma cirratum), being fed in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize
Nurse shark (Ginglymostoma cirratum), with boat in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize
Nurse sharks (Ginglymostoma cirratum), massing in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize
Southern stingray (Hypanus americanus), with snorkeler in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize
Southern stingray (Hypanus americanus) over sand in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize
Southern stingray (Hypanus americanus) over sand in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize
Tourists hand-feeding tarpon (Megalops atlaticus), at feeding station inside the Mesoamerican Barrier Reef, Belize
Tourists hand-feeding tarpon (Megalops atlaticus), at feeding station inside the Mesoamerican Barrier Reef, Belize
West Indian manatee (Trichechus manatus), with sharksucker, Caye Caulker, inside the Mesoamerican Barrier Reef, Belize
West Indian manatee (Trichechus manatus), with snorkelers near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize
West Indian manatee (Trichechus manatus), with snorkeler near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize
West Indian manatee (Trichechus manatus), with snorkeler near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize
Long straight road in Mangystau, Kazakhstan, Central Asia, Asia
Green sea turtle (Chelonia mydas), feeding on the sand near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize
Green sea turtle (Chelonia mydas), feeding on the sand near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize
Green sea turtle (Chelonia mydas), feeding on the sand near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize
Green sea turtle (Chelonia mydas), surfacing for air near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize
Caribbean spiny lobster (Panulirus argus), underwater at Half Moon Caye, UNESCO, Mesoamerican Barrier Reef, Belize
A myriad of fish and coral underwater at Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize
A myriad of fish and coral underwater at Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize
Green sea turtle (Chelonia mydas), surfacing for air near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize
Green sea turtle (Chelonia mydas), with snorkeler near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize
Adult dwarf minke whale (Balaenoptera acutorostrata), with snorkeler, Great Barrier Reef, Queensland, Australia, Pacific
Jinshanling section of the Great Wall of China, UNESCO World Heritage Site, near Beijing, China, Asia
A well-camouflaged yellow stingray, Urobatis jamaicensis, swims over a shallow seagrass meadow growing within Turneffe Atoll's lagoon in the Caribbean Sea. This reef is part of the massive Mesoamerican Reef System, the second largest barrier reef on Earth
Adult dwarf minke whale (Balaenoptera acutorostrata), underwater near Ribbon 10 Reef, Great Barrier Reef, Queensland, Australia, Pacific
A colorful West Indian starfish, Oreaster reticulatus, crawls over a shallow, sandy seafloor in Turneffe Atoll in the Caribbean Sea. This reef is part of the massive Mesoamerican Reef System, the second largest barrier reef on Earth.
Tourists hand-feeding tarpon (Megalops atlaticus), at feeding station inside the Mesoamerican Barrier Reef, Belize
Thames Barrier on the River Thames, London, England, United Kingdom, Europe
Adult dwarf minke whale (Balaenoptera acutorostrata) with snorkelers near Ribbon 10 Reef, Great Barrier Reef, Queensland, Australia, Pacific
Jinshanling section of the Great Wall of China, UNESCO World Heritage Site, near Beijing, China, Asia
People on the Badaling section, the Great Wall of China, UNESCO World Heritage Site, near Beijing, China, Asia
Window barrier, Bou Inania Medersa, Medina, Meknes, Meknes-Tafilalet, Morocco, North Africa, Africa
Barrier Canyon style pictographs, Indian Rockart Pictographs, Sego Canyon, Utah, United States of America, North America
Adult dwarf minke whale (Balaenoptera acutorostrata), underwater with snorkeler near Ribbon 10 Reef, Great Barrier Reef, Queensland, Australia, Pacific
Straw umbrellas on empty white sand beach with clear sea behind, Ilha do Farol, Culatra Barrier Island, Olhao, Algarve, Portugal, Europe
Coyote tracks in the barkhan sand dunes on the barrier island of Isla Magdalena, Baja California Sur, Mexico, North America
Adult female dwarf minke whale (Balaenoptera acutorostrata) underwater near Ribbon 10 Reef, Great Barrier Reef, Queensland, Australia, Pacific
Empty white sand beach and breaking waves of crystal clear sea, Ilha do Farol, Culatra barrier island, Olhao, Algarve, Portugal, Europe
Wind swept barkhan sand dunes on the barrier island of Isla Magdalena, Baja California Sur, Mexico, North America
Urban fox at the London Barrier, London, England, United Kingdom, Europe
Thames Flood Barrier with Docklands and Canary Wharf panorama from Woolwich, London, England, United Kingdom, Europe
View of traffic and architecture on Corso Umberto I, Naples, Campania, Italy, Europe
The Great Wall, Beijing, China, Asia
The River Thames Flood Barrier, one of the largest movable flood barriers in the world, with Canary Wharf in the background, London, England
Thames Barrier on River Thames at dusk, Woolwich, London, England, United Kingdom, Europe
Rideau Canal, Ottawa, Ontario, Canada, North America
Canary wharf, Docklands, and the Thames Barrier, London, England, United Kingdom, Europe
Green Island, Great Barrier Reef, Cairns, Queensland, Australia, Pacific
Thames Barrier dusk panorama with Canary Wharf beyond, London, England, United Kingdom, Europe
Thames Barrier on the River Thames, London, England, United Kingdom, Europe
The wall of Ston, Peljesac Peninsula, Croatia, Europe
The Eastern Point lighthouse, Gloucester, Massachussetts, New England, United States of America, North America
Canary Wharf, Docklands, and Thames Barrier at dusk, London, England, United Kingdom, Europe
Sea walls of the Old City of Akko, Israel
Green Island, Great Barrier Reef, Cairns, Queensland, Australia, Pacific
Old city walls, Rhodes, Dodecanese, Greek Islands, Greece, Europe
Abstract of building, Paris, France, Europe
The Thames Flood Barrier, Woolwich, near Greenwich, London, England, United Kingdom, Europe
Restored section of the Great Wall (Changcheng), northeast of Beijing, Mutianyu, China, Asia
The Great Wall of China, UNESCO World Heritage Site, China, Asia
The Great Wall of China, UNESCO World Heritage Site, Beijing, China, Asia
The Great Wall of China, UNESCO World Heritage Site, Beijing, China, Asia
The Great Wall of China, UNESCO World Heritage Site, China, Asia
Thames Barrier, Woolwich, London, England, United Kingdom, Europe
The Great Wall of China, UNESCO World Heritage Site, near Beijing, China, Asia
The Great Wall, near Jing Hang Ling, UNESCO World Heritage Site, Beijing, China, Asia
The Great Wall, near Jing Hang Ling, UNESCO World Heritage Site, Beijing, China, Asia
Thames Barrier, O2 Arena, Canary Wharf, London, England, United Kingdom, Europe
Mountain sheep and goats roaming in road delay Nissan Qashgai 4x4 car in Val de Tena, the Spanish Pyrenees, Northern Spain
Traditional dry stone wall, vertical sloping stones, in field in The Burren, County Clare, West of Ireland
Sheep and goats roaming around Nissan Qashqai 4-wheel drive vehicle on road in Val de Tena in the Pyrenees Northern Spain
Traditional dry stone wall in meadow in The Burren, County Clare, West of Ireland
Traditional dry stone wall in meadow in The Burren, County Clare, West of Ireland
The ancient Great Wall of China snaking through mountains at Mutianyu, north of Beijing (formerly Peking)
The ancient Great Wall of China snaking through mountains at Mutianyu, north of Beijing (formerly Peking)
The ancient Great Wall of China at Mutianyu, north of Beijing (formerly Peking)
Tourists walk the ancient Great Wall of China at Mutianyu, north of Beijing (formerly Peking), China
Watchtower arch of the Great Wall of China at Mutianyu, north of Beijing (formerly Peking), China
Hoar frost on barbed wire fence and dry-stone wall, Oxfordshire, England, United Kingdom