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

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

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

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

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

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.

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

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

Graham Eaton,Graham Eaton / A hatchling Leatherback Turtle (Dermochelys coriacea) nearing the waters edge, Cayenne, French Guiana

Fred Bavendam / Horseshoe Crab (Limulus polyphemus) group crawling ashore on the high tides of spring to lay their eggs in Delaware Bay's sandy beaches, New Jersey

Fred Bavendam / Horseshoe Crab (Limulus polyphemus) group crawling ashore on the high tides of spring to lay their eggs in Delaware Bay's sandy beaches, New Jersey

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...