Astley and Bedford Mosses are areas of peat bog south of the Bridgewater Canal and north of the Liverpool and Manchester Railway. They are situated about 2+1⁄2 miles (4 km) south-east of Leigh, in Astley and Bedford, Greater Manchester, England. They are among the last remaining fragments of Chat Moss, the raised bog that once covered a large area, of around 10+2⁄3 square miles (28 km2), south Lancashire north of the River Mersey. Astley Moss was designated a Site of Special Scientific Interest in 1989. Astley and Bedford Mosses, along with Risley Moss and Holcroft Moss, are part of Manchester Mosses, a European Union designated Special Area of Conservation.