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.