John Chan / Flock of Western sandpipers (Calidris mauri) taking flight from salt marsh, Southern California, USA.

John Chan / American avocet (Recurvirostra americana) foraging in salt marsh, Southern California, USA.

Milan Radisics / Aerial shot of the Gemasolar Thermosolar Plant owned by Torresol Energy, it uses molten salt as its heat transfer fluid and energy storage medium to produce energy for up to 24 hours a day, Seville, S...

Milan Radisics / Aerial shot of the Gemasolar Thermosolar Plant owned by Torresol Energy, it uses molten salt as its heat transfer fluid and energy storage medium to produce energy for up to 24 hours a day, Seville,...

Juan Carlos Munoz / Aerial view of Salinas de Janubio, La Hoya, Lanzarote Island, Canary Islands. December 2018.

Daniel Heuclin / Vicuna (Vicugna vicugna), five running across salt flat with mountain in background. Salar de Ascotan, Chile. September 2018.

Guy Edwardes / Saltmarsh. Isle of Harris, Scotland, UK. March, 2015.

Guy Edwardes / Saltmarsh on the Isle of Harris, Outer Hebrides, Scotland, UK. November 2016.

Dave Bevan / Grey plover (Pluvialis squatarola) eating a marine flatworm, Norfolk, England, UK, February.

Jack Dykinga / Eroded salt laden sandstone 'fins' in incredible sculpted forms comprise an area know as 'Little Finland.' Gold Butte National Monument, Nevada, USA. President Barack Obama designated the monument on...

Jack Dykinga / Eroded salt laden sandstone 'fins' in incredible sculpted forms comprise an area know as 'Little Finland.' Gold Butte National Monument, Nevada, USA. President Barack Obama designated the monument on...

Jack Dykinga / Eroded salt laden sandstone 'fins' in incredible sculpted forms comprise an area know as 'Little Finland.' Gold Butte National Monument, Nevada, USA. President Barack Obama designated the monument on...

Jack Dykinga / Dead Vlei, with dessicated 900 year old trees standing in the salt pan surrounded by towering red sand dunes. Namib-Naukluft National Park, Namibia. June 2013.

Jack Dykinga / Dead Vlei, with dessicated 900 year old trees standing in the salt pan surrounded by towering red sand dunes. Namib-Naukluft National Park, Namibia. June 2013.

Jack Dykinga / Dead Vlei, with dessicated 900 year old trees standing in the salt pan surrounded by towering red sand dunes. Namib-Naukluft National Park, Namibia. June 2013.

Jack Dykinga / Deadvlei, with dessicated 900 year old trees standing in the salt pan surrounded by towering red sand dunes. Namib-Naukluft National Park, Namibia. June 2013.

Jack Dykinga / Deadvlei, with dessicated 900 year old trees standing in the salt pan surrounded by towering red sand dunes. Namib-Naukluft National Park, Namibia. June 2013.

Neil Aldridge / Black-backed jackal (Canis mesomelas) standing in the middle of the vast Makgadikgadi Pans, Botswana.

Eric Baccega / Dallol hot spring with salt concretions coloured by sulphur, potassium and iron, Dallol Volcano, Danakil Depression, Ethiopia, March 2015.

Eric Baccega / Dallol hot spring with salt concretions coloured by sulphur, potassium and iron, Dallol Volcano, Danakil Depression, Ethiopia, March 2015.

Eric Baccega / Dallol hot spring with salt concretions coloured by sulphur, potassium and iron, Dallol Volcano, Danakil Depression, Ethiopia, March 2015.

Eric Baccega / Afar men mining salt at Lake Assale. Danakil depression, Afar region, Ethiopia, March 2015.

Eric Baccega / Salt caravans made up of hundreds of Dromedary camels (Camelus dromedarius) and their pullers transporting salt slabs cut from Lake Assale to the Mekele Market, Danakil depression, Afar region, Ethiop...

Eric Baccega / Salt caravans made up of hundreds of Dromedary camels (Camelus dromedarius) and their pullers transporting salt slabs cut from Lake Assale to the Mekele Market, Danakil depression, Afar region, Ethiop...

Ernie Janes / Aerial view of boats in East Fleet, with Pinewoods caravan park, and salt marshes on the coast of Norfolk, England, UK, February 2009.

Jean E. Roche / Aerial view of Salin de Giraud, Camargue, France, July.

Jean E. Roche / Aerial view of Salin de Giraud, Camargue, France, July.

Ernie Janes / Sea lavender (Limonium vulgare) growing in saltmarsh, with Blakeney Village in the background, Norfolk, England, UK, July.

Paul Williams / View from plane of landscape between Alice Springs and Perth, Australia, November.

Paul Williams / View from plane of eroded salt dome, Kavir Desert, Iran, December.

David Pattyn / Humpback Whale (Megaptera novaeangliae) tail slapping, tail lob, lobtailing. Vancouver Island, British Columbia, Canada, July.

Michele Westmorland / Large school of scalloped hammerhead sharks (Sphyrna lewini). Galapagos Islands.

Chris & Monique Fallows / Indo Pacific Sailfish (Istiophorus platypterus) feeding on sardines (Sardina pilchardus), Isla Mujeres, Mexico, March.

Chris & Monique Fallows / Black browed albatros (Thalassarche melanophrys), Cape Point, South Africa.

Georgette Douwma / Coral reef scenery with a pair of Red Sea raccoon butterflyfish (Chaetodon fasciatus), Pygmy sweepers (Parapriacanthus guentheri) and soft corals (Dendronephthya sp) Egypt, Red Sea.

Georgette Douwma / Striated fusilier (Caesio striatus) school feeding on fish spawn at dusk. Egypt, Red Sea.

Georgette Douwma / Lyretail anthias / Goldies (Pseudanthias squamipinnis) over coral reef with soft corals (Dendronephthya sp) Egypt, Red Sea.

Cheryl-Samantha Owen / Mountains silhouetted in fog, Knight Inlet, East Coast, Vancouver Island, British Columbia, Canada, July.

Jean E. Roche / Salt pans with high salt concentration. Salin de Giraud, Camargue, France, June 2013.

Jean E. Roche / Salt pans with high salt concentration. Salin de Giraud, Camargue, France, June 2013.

Nature Production / Luminescent Dwarf Squid (Watasenia scintillans) Osezaki, Shizuoka Prefecture, Japan

Chris & Monique Fallows / Southern right whale (Eubalaena australis) breaching, False Bay, Cape Town, South Africa.

Chris & Monique Fallows / Southern right whale (Eubalaena australis) spyhopping, False Bay, Cape Town, South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) near surface, Seal Island, False Bay, South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Chris & Monique Fallows / Common dolphin (Dephinus delphis) porpoising, False Bay, Cape Town, South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) attacking Cape fur seal (Arctocephalus pusillus) Seal Island South Africa.