Resort huts beside coral sand beach, lagoon has outer coral reef, Mana Island, Mamanuca Group, west of Viti Levu, Fiji, South Pacific islands, Pacific

People snorkelling on Outer Great Barrier Reef near Cairns, North Queensland, Australia, Pacific

People snorkelling on Outer Great Barrier Reef near Cairns, North Queensland, Australia, Pacific

Lagoon with coral sand beach protected by outer coral reef, Mana Island in Mamanuca Group, Fiji

Seaplane in Great Barrier Reef Marine Park, Whitsunday Islands National Park, Whitsunday Islands, Queensland, Australia, Oceania

Raiatea or Ra'iatea, outer reef, atoll, Leeward Islands, Society Islands, French Polynesia, Pacific Ocean

Outreef with reef channels, Divehi, Kandu, Meemu Atoll or Mulaktholhu Atoll, Indian Ocean, Maldives, Asia

Outer reef with large dredged sand areas, Vaavu Atoll or Felidhu Atoll, Indian Ocean, Maldives, Asia

Aerial view of the outer reef and Goofnuw Channel looking south to the island of Yap, Yap, Micronesia

French Polynesia, Tahiti, Bora Bora, Picnic table and umbrella in clear lagoon water.

French Polynesia, aerial over atoll, view from above small white clouds outer barrier reef surrounds inner lagoon.