Raccoon butterflyfish (Chaetodon lunula) and saddle wrasse (Thalassoma duperrey), off the island of Lanai, Hawaii, United States of America, Pacific, North America

A colorful set of gorgonians, reef-building corals, and other invertebrates grow on a diverse reef in the Caribbean Sea.

A myriad of hard and soft corals compete for space on the substrate of the snorkel site known as the Milky Way, Palau, Micronesia, Pacific

A diverse array of corals grow in Raja Ampat, Indonesia. This beautiful region is known for its spectacular reefs and high marine biodiversity.

A colorful set of gorgonians, reef-building corals, and other invertebrates grow on a diverse reef in the Caribbean Sea.

A vibrant and diverse coral reef grows amid the tropical islands of Raja Ampat, Indonesia.

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

An unusual sea star (Linckia laevigata) clings to a diverse reef near the island of Bangka, Indonesia. This beautiful, tropical region is home to an incredible variety of marine life.

A colorful set of gorgonians, reef-building corals, and other invertebrates grow on a diverse reef in the Caribbean Sea.

Soft coral colony (Sinularia sp.) Coral colony growing on a diverse and healthy tropical reef. Komodo, Indonesia, Pacific Ocean.

Giant frogfish (Antennarius commersoni) Adult fish blends into a diverse coral reef. Cannibal Rock, Horseshoe Bay, Rinca Island, near Komodo, Indonesia.

Jourdan's turban (turbo jourdani) large gastropod shell, reddish-brown, Rottnest Island reef, wild, day, marine protected area, free-diving off, cool temperate waters of Western Australia. MORE INFO: Marine plant common kelp, a dominant feature of the underwater landscape. Protected areas are covered in lush growth of diverse algae, also red algea are here.

Highly diverse coral head, Apo Island marine reserve, Philippines, Visayan sea, Southeast Asia, Asia

Diver looks at diverse coral reef including a green cup coral colony (Tubastrea micrantha) Komodo, Indonesia, Pacific Ocean.

Highly diverse coral head, including hard and soft corals, feather stars, and anthias, Kilima steps, Puerto Galera, Mindoro, Philippines, Southeast Asia, Asia

Scientific divers conducting a survey on a highly diverse coral reef, Namu atoll, Marshall Islands, Pacific

Threadfin anthias (Pseudanthias huchti) swarm around a diverse coral reef. Komodo, Indonesia.

Highly diverse coral reef, mainly fire coral (Millepora platyphylla) and cauliflower coral (Pocillopora meandrina), Namu atoll, Marshall Islands, Pacific

Highly diverse coral head, including tube sponge (Theonella cylindrica), Apo Island marine reserve, Philippines, Visayan sea, Southeast Asia, Asia

Soft corals (Dendronephthya spp.) growing on diverse coral reef. Komodo, Indonesia, Pacific Ocean.

Snorkeller observes diverse coral reef, Rock Islands, Palau, Caroline Islands, Micronesia, Pacific Ocean, Pacific

Pink anemonefish on sea anemone, Amphiprion periderion, Rongelap, Marshall Islands (N. Pacific).

Highly diverse coral reef, mainly cauliflower coral, Pocillopora spp., and Pavona minuta (background), Namu atoll, Marshall Islands (N. Pacific).

Coral block with different stony corals (Scleractinia), Melithaea gorgonian (Melithaea sp.), Feather star, yellow (Crinoidea) and Sabre squirrelfish (Sargocentron spiniferum), three, Great Barrier Reef, Coral Sea, Pacific, Australia, Oceania

Polyps of a mushroom coral (Fungiidae) Pacific, Great Barrier Reef, UNESCO World Heritage, Australia, Oceania

Open coral polyps on the trunk of a soft coral (Dendronephthya), coral, Pacific, Great Barrier Reef, UNESCO World Heritage, Australia, Oceania

Colony of coral polyps in brain corallae (Physogyra lichtensteini), Pacific, Great Barrier Reef, UNESCO World Heritage Site, Australia, Oceania

Limestone skeleton of the Klunzinger soft coral (Dendronephthya klunzingeri), Pacific, Great Barrier Reef, UNESCO World Heritage, Australia, Oceania

Soft coral, leather coral (Lobophytum) with semi-enclosed polyps, detail, Pacific, Great Barrier Reef, UNESCO World Heritage, Australia, Oceania

Geometric Moray (Gymnothorax griseus), also spotted moray eel, three, patch reef with soft corals (Xenia) and various stony corals, sandy bottom, seagrass bed, Red Sea, Aqaba, Kingdom of Jordan

Open coral polyps on Mopsella sea fan (Mopsella) Pacific, Great Barrier Reef, UNESCO World Natural Heritage, Australia, Oceania

Diver looking at pink coloured soft corals (Dendronephthya), Pacific Ocean, Caroline Islands, Yap, Micronesia, Oceania

Coral reef, reef block overgrown with Klunzinger's Soft Corals (Dendronephthya klunzingeri) and various stone corals (Hexacorallia), swarm Anthias (Anthiinae), Red Sea, Egypt, Africa

Beach bar with different cocktails at sunset at the coral reef Abu-Dabbab, Hilton Nubian Resort, Al Qusair, Marsa Alam, Egypt, Africa

Coral reef, reef waste densely overgrown with many different Soft corals (Alcyonacea), stony corals (Scleractinia) and Anthias (Anthiinae), Red Sea, Egypt, Africa

Diver, huge coral block from different stony corals (Scleractinia), swarm Anthias (Anthiinae) Red Sea, Egypt, Africa

Two Giant morays (Gymnothorax javanicus) looking out of coral reef with different stone corals (Hexacorallia), Red Sea, Egypt, Africa

Diver and a Commerson's frogfish (Antennarius commersoni) perched on a tube sponge off Apo Island, Philippines

Diver and a well camouflaged Commerson's frogfish (Antennarius commersoni) perched at the bow of the wreck of the Alma Jane off Sabang Beach, Puerto Galera, Mindoro, Philippines.