Eastern Ontario (census population 1,763,186 in 2016) (French: Est de l'Ontario) is a secondary region of Southern Ontario in the Canadian province of Ontario which lies in a wedge-shaped area between the Ottawa River and St. Lawrence River. It shares water boundaries with Quebec to the north and New York State to the east and south, as well as a small land boundary with the Vaudreuil-Soulanges region of Quebec to the east.
It includes the cities of Ottawa and Kingston, and the census divisions of the following: the counties of Prescott and Russell, Stormont, Dundas and Glengarry, Lanark, Renfrew, Leeds and Grenville, Frontenac and Lennox and Addington.
Some sources may also include Hastings, Prince Edward, and occasionally Northumberland in the definition of Eastern Ontario, but others classify them as Central Ontario.
The region may also be referred to as Southeastern Ontario to differentiate it from the Northern Ontario secondary region of Northeastern Ontario.
Click on one of the category groups below to drill down into related subcategories.