Alex Mustard / Southern stingray (Dasyatis americana) two swimming over sand bar, under stormy sky. Grand Cayman, Cayman Islands. British West Indies.

Theo Bosboom / Sand patterns at sunrise, Praia da Adraga, Sintra, Portugal. December 2016

Theo Bosboom / Patterns of algae on a limestone rock with sand, White sands beach, Causeway coast, Northern Ireland. April 2016.

Theo Bosboom / Star shaped sand pattern as photographed at low tide at Luskentyre beach, Lewis and Harris, Scotland, UK, October.

Theo Bosboom / Sand patterns created by receding waves, Quiberon, Brittany, France. August 2017

Milan Radisics / Aerial shot of the Hafursa glacial river running over black sand, southern Iceland, August 2018.

David Woodfall / Two Little terns (Sterna albifrons) at the nest amongst Black oats (Avena strigosa) growing on shell rich sands Machair, North Uist, Scotland, UK, June.

David Woodfall / Little tern (Sterna albifrons) at the nest amongst Black oats (Avena strigosa) growing on shell rich sands Machair, North Uist, Scotland, UK, June.

David Woodfall / Sequence of strips of cultivated Machair with early shoots of Black oats (Avena strigosa) pushing through the sand. North Uist, Scotland, UK, June.

Marie Lochman / Sandy Bight - Cape Arid National Park, South west, Western Australia, October 2010

Steven David Miller / Sand bubble patterns created by Sand bubbler crabs (Scopimera inflata), Cape Hillsborough National Park, Queensland, Australia. September.

Ross Hoddinott / Sand dunes, marram grass (Ammophila arenaria) and beach at sunrise, Luskentyre, Isle of Harris, Scotland, UK. October 2018