Sheep in tidal marsh at Mont-Saint-Michel bay with Abbey in the background, UNESCO World Heritage Site, Manche department, Normandy region, France, Europe

A creek at low tide winding through tidal salt marsh with Chesapeake Bay in the background, Virginia, United States of America, North America

Red Knot, (Calidris canutus) flocking on salt marsh on morecambe Bay, Cumbria, UK, a high tide.

Saltmarsh in Cley on the North Norfolk coast, UK.

The Breach at Alkborough created in the sea defences to allow sea water to flood agricultural land and create a wetland for wildlife, Humber Estuary, Humberside, England, United Kingdom, Europe

Aerial view of saltmarsh at low tide near Cadiz, Spain

Aerial view of saltmarsh at low tide near Cadiz, Spain

The Breach at Alkborough created in the sea defences to allow sea water to flood agricultural land and create a wetland for wildlife, Humber Estuary, Humberside, England, United Kingdom, Europe

The Breach at Alkborough created in the sea defences to allow sea water to flood agricultural land and create a wetland for wildlife, Humber Estuary, Humberside, England, United Kingdom, Europe

The Breach at Alkborough created in the sea defences to allow sea water to flood agricultural land and create a wetland for wildlife, Humber Estuary, Humberside, England, United Kingdom, Europe

The Breach at Alkborough created in the sea defences to allow sea water to flood agricultural land and create a wetland for wildlife, Humber Estuary, Humberside, England, United Kingdom, Europe

The Breach at Alkborough created in the sea defences to allow sea water to flood agricultural land and create a wetland for wildlife, Humber Estuary, Humberside, England, United Kingdom, Europe

The Breach at Alkborough created in the sea defences to allow sea water to flood agricultural land and create a wetland for wildlife, Humber Estuary, Humberside, England, United Kingdom, Europe

The Breach at Alkborough created in the sea defences to allow sea water to flood agricultural land and create a wetland for wildlife, Humber Estuary, Humberside, England, United Kingdom, Europe

The Breach at Alkborough created in the sea defences to allow sea water to flood agricultural land and create a wetland for wildlife, Humber Estuary, Humberside, England, United Kingdom, Europe

The Breach at Alkborough created in the sea defences to allow sea water to flood agricultural land and create a wetland for wildlife, Humber Estuary, Humberside, England, United Kingdom, Europe

The Breach at Alkborough created in the sea defences to allow sea water to flood agricultural land and create a wetland for wildlife, Humber Estuary, Humberside, England, United Kingdom, Europe

Salt marshes at dusk. Cerroja water mill. Santoￃﾱa, Victoria and Joyel Marshes Natural Park. Cantabria, Spain, Europe.

Salt marshes at dusk. Cerroja water mill. Santoￃﾱa, Victoria and Joyel Marshes Natural Park. Cantabria, Spain, Europe.

Network of channels and streams at low tide, in the marshland of the Bahia de Cadiz, aerial view, drone shot, Cadiz province, Andalusia, Spain, Europe

Breakwaters or groynes, coastal protection measures, Noderfriedrichskoog tidal flats, Nationalpark Schleswig-Holsteinisches Wattenmeer, Schleswig-Holstein Wadden Sea National Park, Eiderstedt peninsula, North Friesland region, Schleswig-Holstein, Germany,

Saltwort tidal flats, pioneer vegetation, salt marsh vegetation (Salicornia), red in autumn, Norderfriedrichskoog tidal flats, Nationalpark Schleswig-Holsteinisches Wattenmeer, Schleswig-Holstein Wadden Sea National Park, Eiderstedt peninsula, North Fries

View across the Wadden Sea with coastal protection, groynes, Hallig Langeness, small island, at back, North Sea shore, Schleswig-Holstein Wadden Sea National Park, Dithmarschen region, Schleswig-Holstein, Germany, Europe

Seagulls in the marshland adjacent to the Odiel river. At low tide. Aerial view. Drone shot. Huelva province, Andalusia, Spain, Europe

Cloudy sky view over tidal marsh, Cape Cod, Massachusetts