Chat Moss is a large area of peat bog that makes up part of the City of Salford, Metropolitan Borough of Wigan and Trafford in Greater Manchester, England. It also makes up part of Metropolitan Borough of St Helens in Merseyside and Warrington in Cheshire. North of the Manchester Ship Canal and River Mersey, 5 miles (8 km) to the west of Manchester, it occupies an area of about 10.6 square miles (27.5 km2).

The Metropolitan Borough of Wigan is a metropolitan borough of Greater Manchester, England. It is named after its largest town, Wigan but covers a far larger area which includes the towns of Atherton, Ashton-in-Makerfield, Golborne, Hindley, Ince-in-Makerfield, Leigh and Tyldesley. The borough also covers the villages and suburbs of Abram, Aspull, Astley, Bryn, Hindley Green, Lowton, Mosley Common, Orrell, Pemberton, Shevington, Standish, Winstanley and Worsley Mesnes. The borough is also the second-most populous district in Greater Manchester.