Yesnaby is an area in Sandwick, on the west coast of Orkney Mainland, Scotland, south of Skara Brae. It is renowned for its spectacular Old Red Sandstone coastal cliff scenery which includes sea stacks, blowholes, geos and frequently boiling seas. A car park, coastal trail and interpretive panels serve visitors. The area is popular with climbers because of Yesnaby Castle, a two-legged sea stack just south of the Brough of Bigging. The stack is sometimes described as a smaller version of the Old Man of Hoy. Yesnaby is also one of the very few places where Primula scotica grows.GeologyThe coastal cliffs are formed from the Lower Devonian sandstones ascribed to the Yesnaby Sandstone Group - a set of geological formations restricted to the Yesnaby area, and to the overlying beds of the Lower Stromness Flagstones. Fossil stromatolites from 390-400 million years ago can be found in the cliffs in the latter. They are locally known as Horse Tooth Stones from a supposed resemblance.CultureOrkney folklore has it that a woman known as the "Yesnaby Healer" had the ability to stop bleeding in any person, even over a distance. The Orkney composer Peter Maxwell Davies has immortalised Yesnaby through "Yesnaby Ground", an Interlude for solo piano.