aquatic bivalves canada life line low marine mark Molluscs natural nature ocean pacific rock sea starfish tide Vancouver Island water beach bluff corrugated decay down graffiti iron metal New rocks run rundown rust seaweed sky sun urban zealand beginning blue boulder cloud coast coastline cumulus distance distant ending horizon mediterranean shallow shore shoreline wave white block coastal cracked eroded erosion fissure fractured Gower Great Britain littoral plant wales boulders granite island islands land landscape Maddalena mountain pink rocky rough rugged Sardinia view cliff green hillside Pembrokeshire Skomer united kingdom welsh Balearic Islands black danger formation majorca odd peculiar Spain spanish spray spume strange unusual waves algae bare bivalve England exposed kent mollusc mussel Mytilus edulis rockpool shellfish stone cadeira chair chairs coconut palm freedom praia relax relaxed rest salt sand summer vacation big Cabo Girão drop enormous harbour high huge large madeira seascape sheer sudden tall village