Dfa/Dfb borderline). Infrastructure The southern portion of Southewestern Ontario is the most populated and industrialized section of the region. The southern portion is bisected by Highway 401 which runs through Windsor and past London to Woodstock and Waterloo-Wellington region. Highway 402 runs from London to Sarnia. The region is also serviced by major ports in Goderich on Lake Huron, Windsor on Lake Erie and just to the east Hamilton on Lake Ontario which is major destination for regionally produced grain. Windsor, London and Kitchener-Waterloo also have significant regional airports with some international flights. Dialect The accent in the region, Southwestern Ontario English, is distinct from the rest of Ontario. Subdivisions Single-tier municipalities County of Brant Chatham-Kent Haldimand County Norfolk County Separated municipalities City of Brantford City of Guelph City of London City of Owen Sound Pelee Township City of Sarnia Town of St. Marys City of St. Thomas City of Stratford City of Windsor City of Woodstock Town of Tillsonburg Regional municipalities Oxford County Waterloo Region Counties Bruce County Dufferin County (partially extended) Elgin County Essex County Grey County Huron County Lambton County Middlesex County Perth County Wellington County References Geographic regions of Ontario