The Regional Municipality of Durham, informally referred to as Durham Region, is a regional municipality located in Southern Ontario east of Toronto, Ontario. It has an area of approximately 2,500 square kilometres. The towns of Pickering and Ajax, and the township of Uxbridge, make up part of the Toronto Census Metropolitan Area, with the communities of Oshawa, Whitby, and Clarington make up the Oshawa Census Metropolitan Area. The regional government is headquartered in Whitby.