The United Counties of Leeds and Grenville covers a land area of 3,350.57 square km, located on the north shore of the St. Lawrence River; where the world renowned 1000 Islands region of the St. Lawrence River is located. The County is nestled in between Kingston on the west, Cornwall in the east and Ottawa to the north.

The area is connected to New York State via the Ivy Lea/Thousand Island International Bridge and the Prescott/Ogdensburg International Bridge. In addition, it is well-served by provincial highways connecting it to Toronto, Montreal and Ottawa. The Seaway Port of Prescott handles dry bulk materials (grain, road salt and aggregate) in eastern Ontario. Both the Town of Gananoque and the City of Brockville are the gateways to the Thousand Islands region. With the abundance of rivers and lakes, tourism is a major economic sector in the area.

Within the County there reside three separated municipalities, Gananoque, the City of Brockville and Prescott.

Distance from Major Cities to Leeds and Grenville

From	To Central Leeds-Grenville (Athens)
	Est. Distance (km)	Est. Distance (miles)	Est. Driving Time
Kingston, Ontario	85	53	1 hr
Trenton, Ontario	177	110	2 hrs
Toronto, Ontario	341	211	3 hrs 30 min
Ottawa, Ontario	133	82	1 hr 20 min
Montreal, Quebec	225	139	2 hrs 10 min
New York, New York	371	230	7 hrs
Detroit, Michigan	433	268	8 hrs