Duncan Murrell / Mangroves on Tupeti Island, Southern Lagoon, Forgotten Coast, Lagoons of New Caledonia: Reef Diversity and Associated Ecosystems UNESCO World Heritage Site. New Caledonia.

Shane P. White / Freshwater lagoons amid sand dunes, Lencois Maranhenses National Park, Brazil

Claudio Contreras / Aerial view of Red mangrove (Rhizophora mangle) coastal lagoon, Sian Ka'an Biosphere Reserve, Caribbean Sea, Mexico, January

Alex Mustard / Pair of divers swimming in the blue lagoon at Silfraa, with fractured rocks in the foreground. Thingvellir National Park, Iceland. May 2011. No release available.

Michael Pitts,Michael Pitts / Engine room ventilator shafts of oil tanker 'Seiko Maru'. Sunk in Chuuk Lagoon 17/18th February 1944, Chuuk Lagoon, Pacific

Gavin Hellier / Aerial view of the famous Blue Lagoon and Belcekiz beach along the 'Turquoise' coast, Oludeniz near Fethiye, Mediterrean Coast, Turkey 2008

Gavin Hellier / Aerial view of the famous Blue Lagoon and Belcekiz beach along the 'Turquoise' coast, Oludeniz near Fethiye, Mediterrean Coast, Turkey 2008

Pete Oxford / Salt mounds and evaporation ponds (sea salt production plant started in the 1600's and worked by african slaves) Cargill Solar Salt Works, Pekelmeer lagoon, Bonaire, Netherlands Antilles, Caribbean

Doug Perrine / Reef manta rays (Manta alfredi formerly Manta birostris) filter feeding on plankton among Silverside fish that are also feeding on the plankton, Hanifaru Bay, Hanifaru Lagoon, Baa Atoll, Maldives, Ind...

Orsolya Haarberg / Glacier ice floating in the Jokulsarlon glacier lagoon, with Fjallsjokull in the background, sunrise, Iceland, September 2010

Oriol Alamany / Glaciar lagoon below Torres del Paine, Torres del Paine National Park, Patagonia, Chile, January 2006

Jouan & Rius / People bathing in the spa waters of the Blue Lagoon with the geothermal power plant in the background, Grindavik, Iceland 2005