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.
English Institute of Sport, Sheffield Championship, held in the nearby Crucible Theatre. Qualifying matches, previously held in Prestatyn, typically take place between late February and early March. Since 2010 the EIS host qualifying matches to all snooker tournaments as well as all PTC events. The EIS-Sheffield was used by British Athletes to train for the 2012 Summer Olympics. In February 2015, it was announced that the English Institute of Sport, Sheffield would be incorporated into the Olympic Legacy Park on the site of the old Don Valley Stadium. English Institute of Sport, Sheffield The English Institute of Sport is a multi-sport facility in Sheffield, England.