This wall is typically seaside in character, with the sides being covered with an assortment of large pebbles, which have been secured when the concrete / cement rendering was still wet. The background adds further context to this image, with the shingle / sand beach and lapping blue sea along the shoreline, while in the foreground is a pathway made from paving slabs.
Relevant image keywords:
beach, built structure, coastline, concrete, grey, harbour, harbour wall, lapping water, lichen, moss, no people, outdoors, pathway, paving, pebble beach, pebbles, promenade, rows, sea, seafoam, seaside, seaside stone wall, shingle, shingle beach, shore, shoreline, stone, stone wall, tide, wall, waterfront, waves, weathered