Sula Sgeir is a small, uninhabited Scottish islet in the North Atlantic, 18 kilometres west of Rona. One of the most remote islands of the British Isles, it lies approximately forty nautical miles north of Lewis and is best known for its population of gannets. It has a narrow elongated shape running north-northeast to south-southwest, and is approximately 900 m long by typically 100 m wide.

Rona is an uninhabited Scottish island in the North Atlantic. It is often referred to as North Rona to distinguish it from the island of South Rona in the Inner Hebrides. It has an area of 109 hectares and a maximum elevation of 108 metres (354 ft).