What a great theme, Anders!
Canada, Lake Superior, Agawa Bay.
This is a rock face that is on Agawa Bay. The rock below slopes 120º to a sheer drop-off into the lake. Perhaps on the cliff you can see red ochre paintings done by the Ojibway people, a fish and a sea snake. The gold is lichen and the other colors are natural rock. Acid rain has gravely faded these paintings and others in this location. They are difficult to photograph as there is no railing and if you slip you and your camera roll into the cold deep water.
A sea anemone makes its home on the Florida gulf rocks. It is underwater.