Cambridge (2011 population 126,748) is a city located in Southern Ontario at the confluence of the Grand and Speed rivers in the Regional Municipality of Waterloo, Ontario, Canada. It is an amalgamation of the City of Galt, the towns of Preston and Hespeler, and the hamlet of Blair. Galt covers the largest portion of Cambridge, making up the southern half of the city. Preston and Blair are located on the western side of the city, while Hespeler is in the most northeasterly section of Cambridge. Cambridge began as a composite city in 1973, when the City of Galt, Towns of Preston and Hespeler, and the hamlet of Blair were amalgamated.