Grange-over-Sands is a town and civil parish on the north side of Morecambe Bay in Cumbria, England, a few miles south of the Lake District National Park. In the 2011 census the parish had a population of 4,114, increasing at the 2021 census to 4,279. Within the boundaries of the historic county of Lancashire, the town became administered as an urban district in 1894. Though the town remains part of the Duchy of Lancaster, since 2023 it has been administered as part of the Westmorland and Furness Council area.

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.