Markham–Thornhill – Existing boundaries

Consisting of that part of the Regional Municipality of York comprised of that part of the Town of Markham described as follows: commencing at the intersection of the southerly limit of said town with Bayview Avenue; thence generally northerly along said avenue to Highway No. 407; thence easterly along said highway to the Rouge River; thence generally southeasterly along said river to the southerly limit of said town; thence westerly along said limit to the point of commencement.