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.