underwater view of a rocky lakebed with crystal-clear water refracting sunlight and a reflection of the cliffs on the surface

waves water view underwater tranquility texture surface sunlight submersed submerged stones stone shore serenity scenic rocky rocks ripples refracting reflection pure pristine pebble peaceful nature mineral light landscape lakebed lake geology freshwater europe estonia environment ecosystem deep crystalclear coast cliffs clear calm boulder bottom bedrock baltic aquatic algae