close-up of mossy stones on a breakwater along the delta works

bay beach breakwater brown close closeup coast coastal coastline concept dam day defense delta dike dutch dyke environment europe gray green holland irregular mold moss mossy natural nature netherlands nobody ocean pattern protection reef rhinemeusescheldt rock rural sand scenic sea seashore seaside season seawall shore shoreline south stone stones storm sunlight sunny surface texture tranquil view water waterfront weather white works yellow zeeland