Cambridge 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 was formed in 1973 by the amalgamation of the Galt, Preston, Hespeler, the settlement of Blair and a small portion of surrounding townships. The first mayor of Cambridge was Claudette Millar. The former Galt covers the largest portion of Cambridge, making up the southern half of the city.