Southdown is located at the southwest corner of Mississauga. It shares a border with the Town of Oakville to the west. To the east is the Clarkson Village neighbourhood. The QEW highway is located to the north and Lake Ontario to the south. The residential area is situated north of Royal Windsor Drive with a commercial business corridor to the south. Sheridan Creek meanders through this neighbourhood spilling out to the Rattray Marsh Conservation Area situated on the shoreline of Lake Ontario. Southdown neighbourhood landmarks include the Clarkson Community Centre and Library. Clarkson Park, Ontario Racquet Club and Scooter’s Roller Palace.