Lihou is a small tidal island located off the west coast of Guernsey in the English Channel, situated between Great Britain and France. Administratively, it forms part of the Parish of St Peter's within the Bailiwick of Guernsey. While it has had various owners throughout its history, the island is currently owned by the States of Guernsey.
The island is jointly managed by the Lihou Charitable Trust and the Guernsey Environment Department. Historically used by locals for collecting seaweed as fertilizer, Lihou now primarily serves as a destination for tourism and school trips. It is also a significant conservation site, designated as a Ramsar wetland for the protection of rare plants and birds, and contains historic ruins including a farmhouse and a priory.