the sun's rays pierce the water column, illuminating the thickets of posidonia oceanica off the coast o

photosynthesis mediterranean illuminating biodiversity transparency conservation tranquility appeasement underwater posidonia ecosystem landscape thickets oceanica sunlight seagrass contrast daylight serenity silence ecology biology natural harmony habitat seaweed riviera pierce column shadow france plants seabed nature oxygen marine beauty water coast light world ocean clear green color depth flora fauna dazur suns rays play nice blue life cote sea sun