Sheffield has a wider urban population of around 582,500 people and is genuinely unusual among English cities: roughly a third of it sits inside the Peak District National Park. The University of Sheffield, a founding Russell Group member, teaches about 28,280 students from a city centre campus of around 290 buildings, while Sheffield Hallam University enrols over 30,765 students, making it the UK's 14th largest university. Sheffield earned its Steel City nickname from centuries of cutlery and steel making, including the 1912 invention of stainless steel, and now counts more than 250 parks and 4.5 million trees among its green credentials.
