Brockville is located in the Thousand Islands region on the St. Lawrence River in Leeds & Grenville County, Eastern Ontario, Canada. Known as the "City of the 1000 Islands", Brockville is located on the north shore of the St. Lawrence River, directly opposite Morristown, New York, about half-way between Cornwall in the east and Kingston in the west and a little over an hour's drive south of the nation's capital, Ottawa. Brockville is one of the oldest cities in Ontario and is named after the British general Sir Isaac Brock.