Sheffield, a city in South Yorkshire, England, is the seat of the City of Sheffield's government. The River Sheaf, which flows through the city, gave rise to the name. It was formerly a part of the West Riding of Yorkshire, and portions of its southern suburbs were given to the city council by Derbyshire. The largest community in South Yorkshire is there.
The city is situated in the valleys of the River Don and its four tributaries—the Loxley, the Porter Brook, the Rivelin, and the Sheaf—in the eastern foothills of the Pennines. A third of Sheffield is located within the Peak District national park, and 61% of the city is made up of green space.