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

Philip Stephen / Fishing vessel "Ocean Pioneer" nearing Fraserburgh Harbour, with waves crashing against the harbour wall. Scotland, February 2011.

David Woodfall / Waves crashing against the sea wall with a coast guard walking along it, Rhyl, Wales. January.

Dave Bevan / Flock of Turnstones (Arenaria interpres) feeding on a sea wall, disturbed by a runner, Devon, England, UK, January

Dave Bevan / Flock of Turnstones (Arenaria interpres) feeding on a sea wall, Devon, England, UK, January

Juan Carlos Munoz / Monastery terraces on Skellig Michael, Skellig Islands World Heritage Site, County Kerry, Republic of Ireland. September 2015.

Nick Upton / View of Dubrovnik old town and ancient city walls, Croatia, July 2014.

Ernie Janes / Sea wall and housing vulnerable to flooding around The Wash, Snettisham, Norfolk, England, UK, February 2015.

Ernie Janes / Sea wall and housing vulnerable to flooding around The Wash, Snettisham, Norfolk, England, UK, February 2015.

Jean E. Roche / Dyke restored to protect Salin de Giraud saltpans from sea, Camargue, France, February.

Ernie Janes / Repairs to Cromer sea wall after the tidal surge in December 2013, Norfolk, England, UK. January 2015.

Christophe Courteau / Spring tide waves at Saint-Malo, Ille-et-Vilaine, Brittany, France. February 2014.

Loic Poidevin / Waves crashing at harbor entrance during storm. Prieur Saint Nicolas, Les Sables d' Olonne, Vendee, France, March 2014.

Charlie Summers / Four black-legged kittiwakes (Rissa tridactyla) resting on sea wall at Stromness, Orkney Islands, Scotland, UK, July.

Ernie Janes / View of coastal sea defences, Walcott, Norfolk, England, UK, February.

Gavin Hellier / Church tower, Oia (La), Santorini (Thira), Cyclades Islands, Aegean Sea, Greece, 2010

Gavin Hellier / Brimstone Hill Fortress which is situated 790 feet above sea level, the 18th Century compound is lined with 24 cannons and is the largest and best preserved Fortress in the Caribbean - Brimstone Hill...

Gavin Hellier / Brimstone Hill Fortress which is situated 790 feet above sea level, the 18th Century compound is lined with 24 cannons and is the largest and best preserved Fortress in the Caribbean, a National Park...

Gavin Hellier / Traditional white church, Mykonos (Hora), Cyclades Islands, Greece, 2010

Gavin Hellier / Elevated view over the harbour and old town, Mykonos (Hora), Cyclades Islands, Greece, 2010

Gavin Hellier / Small church on the coast of Mykonos (Hora), Cyclades Islands, Greece, 2010

Gavin Hellier / Large cruise liner docked in the harbour next to the Old Town, Fjord and mountains from the Walls of the Kotor Fortress which forms a continuous belt around the Old Town of Kotor, Bay of Kotorska, Adr...

Gavin Hellier / Large cruise liner docked in the harbour next to the Old Town, Fjord and mountains from the Walls of the Kotor Fortress which forms a continuous belt around the Old Town of Kotor, Bay of Kotorska, Adr...

Mark MacEwen / Green Sea Turtle (Chelonia mydas) Dead while trying to return to the sea after egg laying, Raine Island, Great Barrier Reef, Australia. There are Coral walls on the island that when the turtles head b...

Mark MacEwen / Green Sea Turtle (Chelonia mydas) Dead while trying to return to the sea after egg laying, Raine Island, Great Barrier Reef, Australia. There are Coral walls on the island that when the turtles head b...

Mark MacEwen / Green Sea Turtle (Chelonia mydas) Dead while trying to return to the sea after egg laying, Raine Island, Great Barrier Reef, Australia. There are Coral walls on the island that when the turtles head b...

Mark MacEwen / Green Sea Turtle (Chelonia mydas) Dead while trying to return to the water after egg laying, Raine Island, Great Barrier Reef, Australia. There are Coral walls on the island that when the turtles head...

Toby Roxburgh / Rock mounds laid out as coast defence along the shoreline just north of the old Severn Crossing, River Severn, England, 2010.

Angelo Gandolfi / Giglio porto, the island of Giglio. A corner with remains of Roman walls, National Park of the Tuscany archipelago, Italy, May 2010

Benoit Stichelbaut / House between granite outcrops, Plougrescant, Cotes d'Armor, France. August 2009.

Norbert Wu / Strawberry Anemone (Corynactis californica) group, small anemones with colonies of clones that cover vertical rock walls, California

Philippe Clement / North Sea, beach and sea dyke, Ostend, Belgium

Philippe Clement / North Sea, beach and sea dyke, Ostend, Belgium

Norbert Wu / Cavalla (Caranx sp) school and Great Barracuda (Sphyraena barracuda) swirl behind walls of Sea Fans, Papua New Guinea

Niall Benvie / Man-made coastal defences, East Lothian, Scotland, UK

Roberto Rinaldi / Diver on wall dive, Tubbataha reef, Palawan, Philippines. Model released.

Martin H Smith / Freiston shore, Lincolnshire, UK RSPB. Aug 2002 Sea walls broken down to recreate flooded

Martin H Smith / Freiston shore, Lincolnshire, UK RSPB. Aug 2002 Sea walls broken down to recreate flooded

Martin H Smith / Freiston shore, Lincolnshire, UK RSPB. Aug 2002 Sea walls broken down to recreate flooded

Martin H Smith / Freiston shore, Lincolnshire, UK RSPB. Aug 2002 Sea walls broken down to recreate flooded

Martin H Smith / Freiston shore, Lincolnshire, UK RSPB. Aug 2002 Sea walls broken down to recreate flooded

Martin H Smith / Freiston shore, Lincolnshire, UK RSPB. Aug 2002 Sea walls broken down to recreate flooded

Martin H Smith / Freiston shore, Lincolnshire, UK RSPB. Aug 2002 Sea walls broken down to recreate flooded

Martin H Smith / Freiston shore, Lincolnshire, UK RSPB. Aug 2002 Sea walls broken down to recreate flooded

Martin H Smith / Freiston shore, Lincolnshire, UK RSPB. Aug 2002 Sea walls broken down to recreate flooded

Doug Gimesy / Silver gull (Chroicocephalus novaehollandiae) juvenile, standing on sea wall, Port Philip Bay, Sandringham, Victoria, Australia.

Matthew Maran / Sea Wall at sunset New Forest National Park, Hampshire, England, UK. August 2018.

Nigel Cattlin / Red sandstone East Cliffs at Sidmouth in Devon with severe coastal erosion and landslips destroying gardens close to the town, Sidmouth, Devon, England, December.