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Underwater photo taken during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Underwater photo taken during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Sea Star seen during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Nurse shark (Ginglymostoma cirratum) seen during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Underwater photo taken during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Underwater photo taken during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Underwater photo taken during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Stingray seen during Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Half above and half below view of coral reef at Pulau Setaih Island, Natuna Archipelago, Indonesia, Southeast Asia, Asia

Underwater reef on a remote small Islet in the Badas Island Group off Borneo, Indonesia, Southeast Asia, Asia

Anemonefish in anemone on underwater reef on Jaco Island, Timor Sea, East Timor, Southeast Asia, Asia

Above and below view of coral reef and sandy beach on Jaco Island, Timor Sea, East Timor, Southeast Asia, Asia

Brain coral at night on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Hard and soft corals and sea star underwater on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Brain coral at night on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Hard and soft corals and reef fish underwater on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Adult Moorish idol (Zanclus cornutus), Batu Bolong Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Hard and soft corals and giant clam underwater on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Adult Moorish idols (Zanclus cornutus), Batu Bolong Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Porcupinefish (Diodon hystrix) on house reef at Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

A profusion of coral and reef fish on Batu Bolong, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Yellowmargin moray eel (Gymnothorax flavimarginatus), Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

A profusion of coral and reef fish on Batu Bolong, Komodo Island National Park, Indonesia, Southeast Asia, Asia

False clown anemonefish (Amphiprion ocellaris), Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

A pair of spinecheek anemonefish (Premnas biaculeatus), Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

A profusion of coral and reef fish on Batu Bolong, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Half above and half below view of the Komodo Diving Resort at sunset, Sebayur Island, Flores Sea, Indonesia, Southeast Asia, Asia

A tropical island fringing reef, just offshore from Havodda island, Gaafu Dhaalu atoll, in The Maldives, Indian Ocean, Asia

Aerial view by drone of historical island of Ile au Phare (Ile Aux Fouquets) in between coral reef and Indian Ocean, Mahebourg, Mauritius, Indian Ocean, Africa

Bangka (boat) over coral, Chindonan Island, Calamian Islands, Coron, Palawan, Philippines, Southeast Asia, Asia

Scenic view of the port town of Puerto Ayora, Santa Cruz Island, Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Aerial of a traditional Dhow on a white sand beach, Goa island near the Island of Mozambique, Mozambique, Africa

Coral Reefs Monument at the waterfront of San Miguel de Cozumel, Cozumel Island, Quintana Roo State, Mexico

Coral Reefs Monument at the waterfront of San Miguel de Cozumel, Cozumel Island, Quintana Roo State, Mexico

Kyphosus sectatrix seen during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

A profusion of hard and soft coral with a giant clam underwater on Tengah Besar Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

A school of batfish (Platax orbicularis) on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Dive boat with young foreign tourists and crew off coral fringed holiday and scuba island, Bunaken, North Sulawesi, Indonesia, Southeast Asia, Asia

Bangka (boat) over coral, Chindonan Island, Calamian Islands, Coron, Palawan, Philippines, Southeast Asia, Asia

A beautiful coral reef grows near a set of limestone islands in Raja Ampat, Indonesia. This remote, equatorial region is known as the heart of the Coral Triangle. It is a popular destination for scuba divers and snorkelers.

Forest-covered limestone islands surround a gorgeous lagoon in a remote part of Raja Ampat, Indonesia. This beautiful region is known as the heart of the Coral Triangle and is a popular destination for scuba divers and snorkelers.

Limestone islands surround a beautiful lagoon in Raja Ampat, Indonesia. This remote region is known as the heart of the Coral Triangle due to its extraordinary marine biodiversity.

Limestone islands surround a beautiful lagoon in Raja Ampat, Indonesia. This remote region is known as the heart of the Coral Triangle due to its extraordinary marine biodiversity.

A beautiful coral reef grows near an island in the Banda Sea, Indonesia. This remote and historic region, known previously for the Spice Islands, harbors extraordinary marine biodiversity.

A crown of thorns starfish (Acanthaster planci) feeds on a coral reef growing near an island in the Banda Sea, Indonesia.

Rugged and remote, limestone islands rise around a beautiful lagoon seascape in Raja Ampat, Indonesia. This region is known as the heart of the Coral Triangle due to its incredible marine biodiversity. It is a popular destination for scuba divers and snor

Morning light shines on a beautiful limestone island in Raja Ampat, Indonesia. This region is known as the heart of the Coral Triangle due to its incredible marine biodiversity. It is a popular destination for scuba divers and snorkelers.

A black-banded sea krait, Laticauda semifasciata, swims over beautiful corals off the remote island of Manuk in the Banda Sea, Indonesia. This volcanic island is known as the island of the snakes.

Adult green sea turtles (Chelonia mydas agassizii) underwater off the west side of Isabela, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Guests from the Lindblad Expedition ship National Geographic Endeavour in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Coral Reefs Monument at the waterfront of San Miguel de Cozumel, Cozumel Island, Quintana Roo State, Mexico

Snorkeler with moon jellyfish (Aurelia sp), in Jellyfish Lake, located on Eil Malk island, Rock Islands, Palau, Micronesia, Pacific

Man leaning on the guardrail of a house on stilts at Cayo Coral, southern headland of Bastimentos Island, Bocas del Toro Archipelago, Republic of Panama, Central America

A beautiful coral reef grows near an island in the Banda Sea, Indonesia. This remote and historic region, known previously for the Spice Islands, harbors extraordinary marine biodiversity.

A beautiful coral reef thrives in shallow water in Indonesia's Banda Sea. This part of eastern Indonesia is home to part of the world's greatest marine biodiversity.

Snorkeler in underwater profusion of hard plate corals at Pulau Setaih Island, Natuna Archipelago, Indonesia, Southeast Asia, Asia

Snorkeler with Galapagos sea lion (Zalophus wollebaeki) underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Aerial of a traditional Dhow on a white sand beach, Goa island near the Island of Mozambique, Mozambique, Africa

A profusion of hard and soft coral underwater on Siaba Kecil, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Humbug Dascyllus (Dascyllus aruanus), in stag horn coral head on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

A school of bigeye trevally (Caranx sexfasciatus), Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Aerial view of Balos Lagoon, Balos Beach and Cape Tigani, Gramvousa Peninsula, Chania Region, Crete, Greek Islands, Greece, Europe

A colony of green barrel sea squirts (Didemnum molle), out over the reef off Bangka Island, Indonesia, Southeast Asia, Asia

Delicate corals grow on a shallow reef near the island of Flores in Indonesia. This beautiful region is known for its spectacular reefs and high marine biodiversity.

Aerial view of beautiful limestone islands scattered about the seascape in Raja Ampat, Indonesia. This tropical area is known for its extraordinary marine biodiversity and is a popular destination for divers and snorkelers.

Guadalupe fur seals (Arctocephalus townsendi), underwater on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America

Underwater profusion of hard plate corals at Pulau Setaih Island, Natuna Archipelago, Indonesia, Southeast Asia, Asia

Snorkeler with Galapagos sea lion (Zalophus wollebaeki) underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Half above and half below on a remote small Islet in the Badas Island Group off Borneo, Indonesia, Southeast Asia, Asia

Underwater reef system on pink sand beach, Komodo National Park, Komodo Island, Indonesia, Southeast Asia, Asia

False clown anemonefish (Amphiprion ocellaris), Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

An adult bluestreak goby (Valenciennea strigata), on the reef off Kri Island, Raja Ampat, Indonesia, Southeast Asia

Snorkeler with golden jellyfish (Mastigias papua etpisoni), in Jellyfish Lake, a marine lake located on Eil Malk island, Rock Islands, Palau, Micronesia, Pacific