Солтүстік-батыс Англияның құрғақ теңіз жағалауы

Estuary in northwest England

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 In 1974, the second largest gas field in the UK was discovered west of Blackpool, with original reserves of over 7 trillion cubic feet (tcf) (200 billion cubic metres). 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.

The rivers Leven, Kent, Keer, Lune and Wyre drain into the Bay, with their various estuaries making a number of peninsulas within the bay. Much of the land around the bay is reclaimed, forming salt marshes used in agriculture. The bay is known for its wildlife populations, being a Special Area of Conservation, Special Protection Area and a Site of Special Scientific Interest, and there is a bird observatory at Walney Island. Some of the surrounding land is also a protected area, forming the Morecambe Bay Pavements, home to rare butterflies such as the high brown fritillary. The bay has rich cockle beds, which have been fished by locals for generations. There are seven main islands in the bay, all to the west; Walney, Barrow, Sheep, Piel, Chapel, Foulney and Roa. Walney is substantially larger than the others, with its southern tip marking the north western corner of the Bay. Sheep, Piel, Chapel and Foulney Islands are tidal and can be walked to at low tide with appropriate care. Local guidance should be sought if walking to Chapel or Piel islands as fast tides and quicksand can be extremely dangerous. Roa Island is linked to the mainland by a causeway, while Barrow Island has been connected to the mainland as part of the docks system at Barrow in Furness.

The extensive sandflats are the remains of a vast sandur or outwash plain established by meltwaters as the last ice age waned. Sea level was still some 3m below present day levels at the start of the Holocene some 11,000 years ago. The Greek geographer and astronomer Claudius Ptolemy (died c170 AD) referred in his writings to Morikambe eischusis as a location on Britain's west coast, lying between the Ribble and the Solway. The sixteenth century scholar William Camden identified the locality as being near Silloth, hence the similar name of that bay but the eighteenth century antiquarian John Horsley who translated Ptolemy into English in 1732 favoured it being the bay on the then Lancashire/Cumberland border. In 1771 historian John Whitaker took up this latter suggestion and the name appeared on maps subsequently. The first recorded to do so being one associated with Father Thomas West's Antiquities of Furness of 1774. Camden believed the name originated with two words meaning crooked sea whilst West offered up white/beautiful haven though current thought is that it refers to a curve of the sea. There have been royally appointed local guides (holding the post of King's Guide to the Sands) for crossing the bay for centuries. This difficulty of crossing the bay added to the isolation of the land to its north which, due to the presence of the mountains of the Lake District, could only be reached by crossing these sands or by ferry, until the Furness Railway was built in 1857. This skirts the edge of the bay, crossing the various estuaries. The London Glasgow railway also briefly runs alongside the bay the only place where the West Coast Main Line actually runs alongside the coast. The bay has quicksand and fast moving tides. On 5 February 2004, at least 21 Chinese illegal immigrant workers drowned after being cut off by the tides while picking cockles. Morecambe Bay is also home to several of the UK's offshore wind farms: West of Duddon Sands, Burbo Bank, Walney, Barrow, and Ormonde.

The bay has Britain's second largest natural gas field, in the Triassic Sherwood Sandstone with a seal of Mercia Mudstone and a Carboniferous source. The North Morecambe Field, found in 1976, to the north, is and started production in 1994. At peak production 15% of UK supply came from the two main fields. as they are taxed at 62%. Production resumed from the South Morecambe field in July 2011.

In 2004, a proposal was made to build a bridge across the bay flanked by wind turbines and using tidal power. Proposals from Northern Tidal Power Gateways in 2019 outlined a tidal barrage with a road running along on top.