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Rugged 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.

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.

Fragile corals grow in extremely shallow water in Komodo National Park, Indonesia. This part of the Coral Triangle is known for its high marine biodiversity and is a popular destination for scuba divers and snorkelers.

Sunlight sparkles through a table coral (Acropora sp.) in Komodo National Park, Indonesia. This tropical region in Indonesia is known for its spectacular coral reefs and high marine biodiversity.

Soft corals, sponges, and other invertebrates compete for space on a beautiful reef in Indonesia. This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

Crinoids cling to a large sponge on a healthy coral reef near the island of Sulawesi, Indonesia. This beautiful, tropical region is home to an incredible variety of marine life.

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 large mantis shrimp (Lysosquilla sp.) uses its excellent eyesight to scan its underwater environment in the Lesser Sunda Islands of Indonesia.

A pair of beautiful nudibranchs (Hypselodoris tryoni) crawl along the seafloor near Alor in the Lesser Sunda Islands of Indonesia.

Detail of a colorful giant clam (Tridacna maxima) growing on a reef near Alor in the Lesser Sunda Islands of Indonesia.

A female ribbon eel (Rhinomuraena quaesita) yawns as it lives on a sandy slope near Alor in the Lesser Sunda Islands of Indonesia.

A broadclub cuttlefish (Sepia latimanus) hovers above a beautiful coral reef in Komodo National Park, Indonesia.

A broadclub cuttlefish (Sepia latimanus) hovers above a beautiful coral reef in Komodo National Park, Indonesia.

A colorful and healthy coral reef thrives in shallow water in Raja Ampat, Indonesia. This remote region is known as the heart of the Coral Triangle due to its extraordinary marine biodiversity.

A warty frogfish (Antennarius maculatus) is well-camouflaged as it waits to ambush prey on a reef in Komodo National Park, Indonesia.

A beautiful Blue Velvet Head Shield sea slug (Chelidonura varians) crawls across a sandy seafloor near Alor in the Lesser Sunda Islands of Indonesia.

A young false clownfish (Amphiprion ocellaris) snuggles into its host anemone in Komodo National Park, Indonesia.

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 pink anemonefish, Amphiprion perideraion, swims above its beautiful host anemone in Wakatobi National Park, Indonesia.

Healthy corals thrive along the edge of a mangrove forest in a remote part of Raja Ampat, Indonesia.

A beautiful coral reef thrives in Komodo National Park, Indonesia. This tropical area in the Lesser Sunda Islands is known for both its amazing marine biodiversity as well its infamous dragons.

View of boats in the bay at Kalami with Corfu Town in background, Corfu, Ionian Sea, Greek Islands, Greece, Europe

View of Ionian Sea and Paralia Mparmpati at dusk, Barbati, Corfu, Ionian Sea, Greek Islands, Greece, Europe

View of tidewater glacier cave found deep inside Neko Harbor on the western side of the Antarctic Peninsula, Polar Regions

Views of the wreck of the Guvernoren, a 20th century whale processing ship, in the Enterprise Islands, Antarctica, Polar Regions

Dramatic Sea Arch of Drangarnir and waves crashing on the Faroe Islands coast, Faroe Islands, Denmark, Atlantic, Europe

View from shore across the calm turquoise waters of Cala Napoletana, Caprera Island, La Maddalena Archipelago National Park, Sassari, Sardinia, Italy, Mediterranean, Europe

View over calm turquoise water to Porto Massimo and the rocky headland of Punta Lunga, La Maddalena Island, La Maddalena Archipelago National Park, Sassari, Sardinia, Italy, Mediterranean, Europe

Shallow turquoise waters lapping shore of the Spiaggia Monti d'a Rena (Monte d'Arena) (Monte di Rena), La Maddalena Island, La Maddalena Archipelago National Park, Sassari, Sardinia, Italy, Mediterranean, Europe

Long line fishing boat in Cross Sound with the Fairweather Mountain Range as backdrop, Southeast Alaska, United States of America, North America

Waves crashing against the shore in Cross Sound, Southeast Alaska, United States of America, North America

Wooden sailing boat anchored in clear turquoise water off Cala Granara, Spargi Island, La Maddalena Archipelago National Park, Sassari, Sardinia, Italy, Mediterranean, Europe

View through cave entrance across the clear turquoise waters of Cala Corsara to the pink granite headland of Punta Rossa Corsara, Spargi Island, La Maddalena Archipelago National Park, Sassari, Sardinia, Italy, Mediterranean, Europe

View from rocky hillside over the calm turquoise waters of Cala Napoletana, Caprera Island, La Maddalena Archipelago National Park, Sassari, Sardinia, Italy, Mediterranean, Europe

Glacial iceberg detail from ice calved off the South Sawyer Glacier in Tracy Arm, Southeast Alaska, United States of America, North America

Foreshore at low tide and cliff, Etretat, Seine-Maritime department, Normandy region, France, Europe

View of Church of the Holy Apostles in Thassos Town at sunset, Thassos, Aegean Sea, Greek Islands, Greece, Europe

View of woodland and village of Panagia nestled in the hillside, Makriammos, Thassos, Aegean Sea, Greek Islands, Greece, Europe

View of Livadi Beach and Holy Monastery of the Archangel Michael from Viewpoint Archangel Michael, Thasos, Thassos, Aegean Sea, Greek Islands, Greece, Europe

View of snow-covered Half Moon Island in the South Shetland Group, Antarctica, Southern Ocean, Polar Regions

View of snow-covered Half Moon Island in the South Shetland Group, Antarctica, Southern Ocean, Polar Regions

Beaches of Arrecifes, Tayrona National Natural Park, Department of Magdalena, Caribbean Region, Colombia, South America

A long exposure to capture the sunrise at Benijo Beach, Tenerife, Canary Islands, Spain, Atlantic, Europe

A single person stands on a long stone breakwater jutting out into the ocean with a large cruise ship in the distance, Estoril, Portugal, Europe

View of the Argentine base Almirante Brown, named after Guillermo Brown of the Argentine Navy, Paradise Bay, Antarctica, Polar Regions

View of the Argentine base Almirante Brown, named after Guillermo Brown of the Argentine Navy, Paradise Bay, Antarctica, Polar Regions

Playa El Holandes, Cabo San Antonio, Guanahacabibes Peninsular, National Park and Biosphere Reserve, Pinar del Rio Province, Cuba, West Indies, Central America

Distinctive rocky headland and popular white sand beach of eroded coral in the North West near Dunvegan, Coral Beach, Claigan, Dunvegan, Skye, Inner Hebrides, Scotland, United Kingdom, Europe

View from the Rubha Hunish lookout bothy to the Shiant Isles and Harris from the most northern tip of Skye, an SSSI due to its igneous geology and maritime cliffs, Rubha Hunish, Duntulm, Skye, Inner Hebrides, Scotland, United Kingdom, Europe

Guests from the Lindblad Expedition ship National Geographic Explorer at Hornsund (Horn Sound) in the Svalbard Archipelago, Norway, Arctic, Europe

The Lindblad Expeditions ship National Geographic Sea Bird operating in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

Aerial of a red sailing boat in the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Aerial of a boat between the icebergs of the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Cliffs and the shoreline, seen at low tide, in Bossiney Haven, near Tintagel, Cornwall, England, United Kingdom, Europe

Evening shoreline, Atlantic surf crashing against the harbour wall at Hartland Quay, north Devon, England, United Kingdom, Europe

The stunning beach, rocks and cliffs at Kynance Cove, seen at at low tide, near the Lizard Point, Cornwall, England, United Kingdom, Europe

View of Miramare e Castello beach and Aragonese Castle in background, Port of Ischia, Island of Ischia, Campania, Italy, Europe

View of Duomo di Santa Maria Assunta and coastline at dusk, Port of Ischia, Island of Ischia, Campania, Italy, Europe

Huge waves breaking on the beach at Ascension Island in the Tropical Atlantic Ocean, South Atlantic Ocean

Driftwood on white sand beach at beautiful Mahoro Island with Masare and Pahepa Islands beyond, Mahoro, Siau, Sangihe Archipelago, North Sulawesi, Indonesia, Southeast Asia, Asia

View of boats and restaurants in Porto d'Ischia (Port of Ischia) at dusk, Island of Ischia, Campania, Italy, Europe

View of fishing nets and boats in Marina di Corricella and Church of Santa Maria delle Grazie in background, Procida, Phlegraean Islands, Gulf of Naples, Campania, Southern Italy, Italy, Europe