Grimsthorpe Lake is a lake

Lake

A lake is a body of relatively still fresh or salt water of considerable size, localized in a basin, that is surrounded by land. Lakes are inland and not part of the ocean and therefore are distinct from lagoons, and are larger and deeper than ponds. Lakes can be contrasted with rivers or streams,...

 in the Moira River

Moira River

The Moira River is a river in Hastings County in eastern Ontario, Canada. It travels from its source in the centre of the county to the county seat Belleville and is named after Francis Rawdon-Hastings, Earl of Moira.-Course:...

 and Lake Ontario

Lake Ontario

Lake Ontario is one of the five Great Lakes of North America. It is bounded on the north and southwest by the Canadian province of Ontario, and on the south by the American state of New York. Ontario, Canada's most populous province, was named for the lake. In the Wyandot language, ontarío means...

 drainage basin

Drainage basin

A drainage basin is an extent or an area of land where surface water from rain and melting snow or ice converges to a single point, usually the exit of the basin, where the waters join another waterbody, such as a river, lake, reservoir, estuary, wetland, sea, or ocean...

s that straddles the border between Tweed

Tweed, Ontario

Tweed is a municipality and a village located in central-eastern Ontario, Canada, in Hastings County.The Municipality of Tweed is an amalgamated municipality comprising the former Village of Tweed and the former Townships of Hungerford and Elzevir & Grimsthorpe...

, Hastings County

Hastings County, Ontario

Hastings County is located in the province of Ontario, Canada. It is The Cheese Capital of Canada. Geographically, it is located on the border of Eastern Ontario and Central Ontario. The population was 125,915 in 2001 and grew to 130,474 in the 2006 Canada Census...

 and Addington Highlands

Addington Highlands, Ontario

Addington Highlands is a township in central eastern Ontario, Canada, in the County of Lennox and Addington.Bon Echo Provincial Park is for the most part located in the township.-Communities:...

, Lennox and Addington County

Lennox and Addington County, Ontario

Lennox and Addington County, Ontario is a county and census division of the Canadian province of Ontario. The county seat is Greater Napanee. It is located in the subregion of Southern Ontario named Eastern Ontario.It includes the following municipalities:...

 in Ontario

Ontario

Ontario is a province of Canada, located in east-central Canada. It is Canada's most populous province and second largest in total area. It is home to the nation's most populous city, Toronto, and the nation's capital, Ottawa....

, Canada

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

.

The lake is about 1.9 kilometres (1.2 mi) long and 0.9 kilometre (0.559235462984826 mi) wide and lies at an elevation of 319 metres (1,047 ft) about 11 kilometres (7 mi) east of the community of Gunter and 17 kilometres (11 mi) northwest of the community of Cloyne

Cloyne, Ontario

Cloyne is a small village in the township of Addington Highlands, Lennox and Addington County, Ontario, Canada. It is located on Ontario Highway 41 about by road north of Kaladar at the crossroads of Highway 41 with Ontario Highway 7, with the settlements of Bishop Corners and Northbrook in...

. The primary inflow is Partridge Creek

Partridge Creek (Ontario)

Partridge Creek is a creek in the Moira River and Lake Ontario drainage basins in Hastings and Lennox and Addington Counties, Ontario, Canada.-Course:...

 from the northwest, and there are three unnamed creek secondary inflows at the southwest, north and south. Partridge Creek is also the primary outflow at the southeast. It flows via the Skootamatta River

Skootamatta River

The Skootamatta River is a river in the Lake Ontario drainage basin in Hastings and Lennox and Addington Counties in Ontario, Canada. It flows from Joeperry Lake to join the Moira River in Tweed...

 and Moira River into the Bay of Quinte

Bay of Quinte

The Bay of Quinte is a long, narrow bay shaped like the letter "Z" on the northern shore of Lake Ontario in the province of Ontario, Canada. It is just west of the head of the Saint Lawrence River that drains the Great Lakes into the Gulf of Saint Lawrence...

 on Lake Ontario at Belleville

Belleville, Ontario

Belleville is a city located at the mouth of the Moira River on the Bay of Quinte in Southern Ontario, Canada, in the Quebec City-Windsor Corridor. It is the seat of Hastings County, but is politically independent of it. and the centre of the Bay of Quinte Region...

.