Mississauga is a city in the Canadian province of Ontario. It is a suburb of Toronto. The city is situated in the Regional Municipality of Peel and covers of land, fronting 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 of the previous mentioned municipalities. Two major river valleys feed into the lake. The Credit River is by far the longest with the heaviest flow. It divides the western side of Mississauga from the central/eastern portions and enters the lake at the Port Credit harbour west of Hurontario Street. The indented, mostly forested valley was inhabited by First Nation peoples long before European exploration of the area. The valley is protected and maintained by the Credit Valley Conservation Authority (CVCA). Etobicoke Creek forms part of the eastern border of Mississauga with the City of Toronto as far north as Eglinton Avenue. North of there it passes through the western infield area of Toronto Pearson International Airport. There have been two aviation accidents, in 1978 and 2005, where aircraft overshot the runway and slid into the Etobicoke creek banks. In 1954, heavy flooding resulted in some homes along the riverbank being swept into the lake after heavy rains from Hurricane Hazel. Since that storm, houses are no longer constructed along this floodplain. This creek and its tributaries are administered by the Toronto and Region Conservation Authority (TRCA). Most land in Mississauga drains to either of the two main river systems, with the exception of the smaller Mary Fix and Cooksville creeks which run roughly through the centre of Mississauga, entering the lake east of Hurontario St. Some small streams and reservoirs are part of the Sixteen Mile Creek system in the far northwest corner of the city, but these drain toward the lake in neighbouring Milton and Oakville. The shoreline of former Glacial Lake Iroquois roughly follows the Dundas Street alignment. It is not noticeable in most places but is very prominent in the vicinity of the Dundas Street and Mavis Road intersection, where the ancient shoreline drops below, affording a clear view of downtown Toronto and Lake Ontario on clear days from the ridge. The land