 Scarborough was also transformed into a borough.Concurrent with the creation of Durham Region, the West Rouge area of Pickering south of Twyn Rivers Drive (the original course of Sheppard Avenue) and east of Port Union Road was annexed into Scarborough.On January 1, 1998, Toronto was greatly enlarged, not through traditional annexations, but as an amalgamation of the Municipality of Metropolitan Toronto and its six lower-tier constituent municipalities; East York, Etobicoke, North York, Scarborough, York, and the original city itself.