Hastings County is located in the province of Ontario, Canada. Geographically, it is located on the border of Eastern Ontario and Central Ontario. Hastings County is the second-largest county in Ontario, after Renfrew County, and its county seat is Belleville, which is independent of Hastings County. Hastings County has trademarked the moniker "Cheese Capital of Canada".

Eastern 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.