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Langsett Reservoir is in Yorkshire, England, near the villages of Langsett and Upper Midhope, on the edge of the Peak District National Park. The reservoir was constructed between 1898 and 1904, and is now managed by Yorkshire Water. Fed by the Little Don or Porter River, it is around a mile long, and supplies water for Sheffield and Barnsley via the Langsett Treatment Works.

Langsett is a village and civil parish near Penistone in South Yorkshire. It lies near the southern edge of the Metropolitan Borough of Barnsley and on the edge of the Peak District National Park. At the 2001 census it had a population of 161, increasing to 222 at the 2011 Census.In the early Medieval period, Langsett was known as Penisale.

Upper Midhope (archaic Over Midhope) is a village in the civil parish of Bradfield within the Stocksbridge and Upper Don electoral ward in the borough of the City of Sheffield, England. It lies just on the edge of the Peak District national park.Historical the habitation, together with Nether Midhope (Midhopestones), were collective known as Midhope.