 Lihou ( / ˈliːuː / ) is a small tidal island located just off the west coast of the island of Guernsey , in the English Channel , between Great Britain and France . Administratively , Lihou forms part of the Parish of St. Peter 's in the Bailiwick of Guernsey , and is now owned by the Parliament of Guernsey ( officially known as the States of Guernsey ) , although there have been a number of owners in the past . Since 2006 , the island has been jointly managed by the Guernsey Environment Department and the Lihou Charitable Trust . In the past the island was used by locals for the collection of seaweed for use as a fertiliser , but today Lihou is mainly used for tourism , including school trips . Lihou is also an important centre for conservation , forming part of a Ramsar wetland site for the preservation of rare birds and plants as well as historic ruins of a priory and a farmhouse . 
