Walney Island, also known as the Isle of Walney, is an island off the west coast of England, at the western end of Morecambe Bay in the Irish Sea. Within the boundaries of the historic county of Lancashire, it is part of Barrow-in-Furness, separated from the mainland by Walney Channel, which is spanned by the Jubilee Bridge. Walney is the largest island of the Furness Islands group, both in population and size, as well as the largest English island in the Irish Sea.