a pebble beach with gentle waves lapping the shore, creating a tranquil coastal scene. mamaia beach, constanta, romania

constanta mamaia romania europe pebble beach gemstone waves shoreline seaside horizon relax soul coast nature sea landscape ocean water travel background seascape shore summer pebbles beautiful natural coastline vacation tourism blue outdoor wave sky rock holiday coastal scenic beauty stone smooth sand bay stones rocky gentle lapping creating tranquil scene scene romania real