Doug Perrine / Bioluminescence from glowing plankton in sea tide line on beach, with stars above and ship lights on horizon, Vaadhoo Island, Raa Atoll, Maldives, Indian Ocean, October 2010

Jurgen Freund / Seastars in tide pool split level {Asteroidea} Canadian pacific coast

Shane Gross / Lemon shark juvenile (Negaprion brevirostris) swimming in mangrove habitat near blue crab (Callinectes sapidus), a prey species for the shark. Eleuthera, Bahamas.

Shane Gross / Lemon shark juvenile (Negaprion brevirostris) trying to feed on the leaves of a red mangrove (Rhizophora mangle). As pups, the sharks have to learn to hunt for themselves and sometimes make mistakes....

David Tipling / Flock of Knot (Calidris canutus) chased by a Peregrine as they arrive to roost at high tide, Cormorants in foreground, Snettisham RSPB Reserve, The Wash, Norfolk, September.

Ross Hoddinott / Westward Ho! beach at sunrise, colourful sky at low tide and tidal pool, north Devon, UK. February.

Jack Dykinga / Patterns in the tidal flats of the delta where the delta is swept by tidal encroachment from the Gulf of California. Evidence of the fresh water flow is observable as plant life turns green. Colorado...

Ross Hoddinott / Luskentye beach, mountains and incoming tide, Isle of Lewis and Harris, Outer Hebrides, Scotland, UK. October 2018.

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

Theo Bosboom / Sea stacks consisting of flysch rock battered by the incoming tide, playa de Gueirua, Asturias, Northwest Spain. October 2015

John Chan / Western gull (Larus occidentalis) feeding on a California two-spot octopus (Octopus bimaculoides) on a mudflat at low tide, Southern California, USA, November.

Duncan Murrell / Coral formations at low tide in Prony Bay in the Southern Lagoon, Lagoons of New Caledonia: Reef Diversity and Associated Ecosystems UNESCO World Heritage Site. New Caledonia.

Philippe Clement / Lined top shells (Phorcus lineatus) in a rock pool, Normandy, France, June

Philippe Clement / Lined top shells (Phorcus lineatus) and Common european limpets (Patella vulgata) in a rock pool, Normandy, France, June.

Jurgen Freund / Timelapse of the tide rising at Cape Leveque, with Mangroves (Rhizophora) in the foreground, Kimberley, Western Australia, 2016

Jurgen Freund / Timelapse of the tide rising in a Mangrove (Rhizophora) forest, Daintree, Wet Tropics World Heritage Area, North Queensland, Australia.

Jurgen Freund / Timelapse of Periwinkle snails (Littoraria) climbing up Mangrove (Rhizophora) roots at lowtide, Daintree, Wet Tropics World Heritage Area, North Queensland, Australia.

Pedro Narra / Aerial view of low tide in Sado estuary, Portugal. November

Theo Bosboom / Seaweed in tide pool, Mangurstadh Beach, Isle of Lewis, Outer Hebrides, October. Highly commended in the Creative Visions category of Wildlife photographer of the year Awards (WPOY) Competition 2018.

Chris Gomersall / Large flock of Red knot (Calidris canutus) moving at high tide roost, in winter plumage, Snettisham RSPB Reserve, Norfolk, England, UK, September.

Guy Edwardes / Warbeth Beach, Stromness, Orkney with view to Hoy. Orkney Islands, Scotland, UK. August 2014.

Guy Edwardes / Rock formations at Kimmeridge Bay, Clavell Tower in background, Isle of Purbeck, Jurassic Coast, Dorset, England, UK. December 2010.

Guy Edwardes / St. Michael's Mount, Marazion, Cornwall, England, UK. September 2016.

Five Films / Aerial view of tide coming in on beach, Pembrokeshire, Wales, UK, January 2017.

Five Films / Aerial view of tide coming in on beach, Pembrokeshire, Wales, UK, January 2017.

John Waters / Large mixed flock of Knot (Calidris canutrus), Dunlin (Calidris alpina) and Golden plover (Pluvialis apricaria) in flight at high tide, Steart Marshes WWT Reserve, Somerset, England, UK, December.

Seth Patterson / A compilation of items found washed up along a half mile stretch of the high tide line of South Padre Island, Texas. October 2016. Some of the plastic bottles and bags of signs of nip marks from hun...

Alex Hyde / Colony of Common Mussels (Mytilus edulis) growing on striated rock formation exposed at low tide. Cornwall, England, UK. Highly commended in the Coast and Marine Category of the British Wildlife Photo...

Theo Bosboom / Limpets (Patellidae) exposed at low tide on the coast of Playa de Ursa, Portugal. Finalist in the Animals in their Environment Category of the Wildlife Photographer of the Year Awards (WPOY) Competiti...

Fred Olivier / Group of Adelie penguins (Pygoscelis adeliae) swimming in a tide crack, lots jump out, Adelie Land, Antarctica, January.

Guy Edwardes / View over Pednvounder Beach towards Logan Rock, Porthcurno, Cornwall, England, UK. April 2009.

Benjamin Barthelemy / Long exposure of tidal water flowing off rocks, with the Okshornan Mountains in the background, Isle of Senja, Troms, Norway, February 2015.

Ross Hoddinott / Ice on black volcanic sand beach with waves, Jokulsarlon, Southeast Iceland, February.

Ross Hoddinott / Trevose Lighthouse at dusk, long exposure at high tide, Trevose, Cornwall, UK. January 2015.

Ernie Janes / Low tide on the Wash, Snettisham, Norfolk, England, UK, February.

Ole Jorgen Liodden / Marine iguana (Amblyrhynchus cristatus) silhouetted on the coast at sunset, Galapagos.

Tui De Roy / Dead Sally-lightfoot crab (Grapsus grapsus) washed up in surf, Puerto Egas, James Bay, Santiago Island, Galapagos, Ecuador, May.

Erlend Haarberg / Rorbu houses in front of Festhelltinden mountain, Hamnoy, Moskenes, Lofoten, Norway, December.

Nick Upton / Timelapse of a Common starfish (Asterias rubens) moving in a rockpool, speeded up four times, Cornwall, England, UK, September.

Nick Upton / Common starfish (Asterias rubens) moving in a rockpool, real time, Cornwall, England, UK, September.

Nick Upton / Common prawns (Palaemon serratus) and a Rock goby (Gobius paganellus) feeding on a dead Montagu's crab (Xantho hydrophilus) in a rockpool, Cornwall, England, UK, September.

Nick Upton / Rock goby (Gobius paganellus) stealing food from a scavenging Common prawn (Palaemon serratus) in a rockpool, Cornwall, England, UK, September.

Steven Kazlowski / Polar bear (Ursus maritimus) curious young bear approaching camera, over newly forming pack ice during autumn freeze up, Beaufort Sea, off Arctic coast, Alaska

Hougaard Malan / Lighthouse at sunset. Kommetjie, Cape Town, South Africa. November 2008.

Hougaard Malan / Large wave crashing against rock shelf. Luphathana, Pondoland, Eastern Cape, South Africa. June 2012.

Ross Hoddinott / Waves washing up Elgol beach in the evening light with a view of the Cuillins, Strathaird peninsula, Isle of Skye, Scotland, UK. December 2013.

Ross Hoddinott / Sunset at Trebarwith Strand with incoming tide, North Cornwall, UK. March 2014.

Mark Taylor / Waves breaking against sea wall and cliffs, Seaford, Sussex, England, UK, 15th February 2014.