The southern and western borders of the city are shared with Derbyshire; in the first half of the 20th century Sheffield extended its borders south into Derbyshire, annexing a number of villages, including Totley, Dore, and the area now known as Mosborough Townships.
The southern and western borders of the city are shared with Derbyshire with the town of Chesterfield in close proximity. In the first half of the 20th century Sheffield extended its borders south into Derbyshire, annexing a number of villages, including Totley, Dore, and the area now known as Mosborough Townships.