Mississauga covers 288.42 square kilometres (111.36 sq mi) of land, fronting 13 kilometres (8.1 mi) of shoreline on Lake Ontario.
Mississauga is bounded by Oakville and Milton to the west/southwest, Brampton to the north, Toronto to the east, and Lake Ontario to the south/south-east. Halton Hills borders Mississauga's north-west corner. With the exception of the southeast border with Toronto (Etobicoke Creek), Mississauga shares a land border with all previous mentioned municipalities
