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.
Sheffield Lock Sheffield Lock Sheffield Lock, at , is a lock on the Kennet and Avon Canal, in the civil parish of Burghfield in the English county of Berkshire. It is also sometimes known as Shenfield Lock. Sheffield Lock was built between 1718 and 1723 under the supervision of the engineer John Hore of Newbury, and this stretch of the river is now administered by Canal & River Trust and known as the Kennet Navigation. It has a rise/fall of 2 ft 2 in (0.66 m). The lock was built in the early 18th century and was originally turf-sided. It was enlarged