Steeles Avenue is an east–west street that forms the northern city limit of Toronto and the southern limit of York Region in Ontario, Canada. It stretches 77.3 km (48.0 mi) across the western and central Greater Toronto Area from Appleby Line in Milton in the west to the Toronto-Pickering city limits in the east, where it continues east into Durham Region as Taunton Road, which itself extends 58 km (36 mi) across the length of Durham Region to its boundary with Northumberland County.