 For example, a less densely populated area within a city's municipal boundaries may not be included as part of its population centre, while areas outside the city limits that directly continue a city's urban core population may be included.For example, the population centre of Toronto extends into neighbouring Peel Region, Halton Region, Durham Region and York Region, encompassing places such as Oakville, Mississauga, Brampton, Vaughan, Markham, Richmond Hill, Aurora, Newmarket, Pickering and Ajax.Despite this, numerous other communities which are considered part of the Greater Toronto Area for political purposes are "not" part of the population centre of Toronto; because more rural areas separate them geographically from the primary zone of urban settlement, communities such as Milton, Georgetown, Caledon, Bolton, Nobleton, Bradford and Stouffville instead form their own separate small or medium population centres, and even a portion of the city of Toronto itself, to the north and east of the Toronto Zoo in Scarborough, is excluded from the population centre as it is much less densely populated than the rest of the city.