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 county of South Yorkshire, and borders on Nottinghamshire's forests and the Derbyshire Dales. The city lies directly next to Rotherham with the M1 designating much of the border between them. Although Barnsley Metropoliton Borough also borders Sheffield to the north, the town itself is a few miles further. Directly to the west of the city is the Peak District National Park and the Pennine upland range, while the lowlands of the South Yorkshire Coalfield lie to the east. The southern border is shared with Derbyshire. Over the past hundred years this has been moved south as the Sheffield urban area