Kitchener, Ontario - is a city in Southern Ontario, approximately 100 km west of Toronto, and the seat of the Regional Municipality of Waterloo. It was the City of Berlin from 1912 until 1916. The city is adjacent to the smaller cities of Cambridge to the south, and Waterloo to the north. Kitchener and Waterloo are often referred to jointly as Kitchener-Waterloo (K-W), although they have separate municipal governments. Including Cambridge, the three cities are known as "the tri-cities."