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. Its population at the 2011 UK Census was 10,651, distributed evenly across the island's two Wards of Walney North and Walney South.

Morecambe Bay is an estuary in northwest England, just to the south of the Lake District National Park. It is the largest expanse of intertidal mudflats and sand in the United Kingdom, covering a total area of 120 sq mi (310 km2). In 1974, the second largest gas field in the UK was discovered 25 mi (40 km) west of Blackpool, with original reserves of over 7 trillion cubic feet (tcf). At its peak, 15% of Britain's gas supply came from the bay but production is now in decline. Morecambe Bay is also an important wildlife site, with abundant birdlife and varied marine habitats.