The City of Kitchener/ktnr/ is a city in Southern Ontario, Canada. Located approximately 100km west of Toronto, Kitchener is the seat of the Regional Municipality of Waterloo. It was the Town of Berlin from 1854 until 1912 and the City of Berlin from 1912 until 1916. The city had a population of 219,153 in the 2011 Census. The metropolitan area, which includes the neighbouring cities of Waterloo and Cambridge, has 507,096 people, making it the tenth largest Census Metropolitan Area (CMA) in Canada and the fourth largest CMA in Ontario. 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". The City of Kitchener covers an area of 136.86 square kilometres. On 10 June 2012, the city of Kitchener celebrated 100 years of cityhood. Activities took place throughout 2012 in honour of this milestone.