Geography of Sheffield (Totley Brook passes south of Totley and meets Old Hay Brook at Needham's Dyke). The Sheaf flows northwards to join the River Don near Blonk Street Bridge in the city centre. This lower section of the River Sheaf together with the River Don, between the present Blonk Street and Lady's Bridge, formed part of the perimeter of Sheffield Castle. Porter Brook's source is just inside the Peak District National Park, to the west of the city, at Clough Hollow, also near Ringinglow. From here it flows eastward to meet the Sheaf, at a point now located underneath Sheffield Midland Station.
Geography of Sheffield a regular occurrence especially in the city centre that was at the bottom of a natural bowl. The River Don became one of the most polluted rivers in Europe. In his 1937 book "The Road to Wigan Pier" George Orwell said that Sheffield 'could justly claim to be called the ugliest town in the Old World'. However, in the 1930s Sheffield City Council and public benefactors such as J.G.Graves started buying rural land around Sheffield in order to protect it from developers. This was one of the earliest examples of greenbelt land. The residential areas cover the majority of the