| Frith Lake | |
| Other Name: | French: lac Frith |
| Location: | Thunder Bay District, Ontario |
| Coordinates: | 49.8747°N -88.6783°W |
| Type: | Lake |
| Part Of: | Great Lakes Basin |
| Outflow: | unnamed creek |
| Basin Countries: | Canada |
| Length: | 1.9km (01.2miles) |
| Width: | 1.1km (00.7miles) |
| Elevation: | 293m (961feet) |
| Pushpin Map: | Canada Ontario |
| Pushpin Map Alt: | Location of Frith Lake on a map of Ontario |
| Pushpin Map Caption: | Location in Ontario |
Frith Lake (French: lac Frith) is a lake in the Unorganized Part of Thunder Bay District in northwestern Ontario, Canada.[1] [2] [3] [4] The lake is on Kelvin Island, a large island in Lake Nipigon, and is thus in the Great Lakes Basin.
The lake is long and wide, and lies at an elevation of .[5] It is on Kelvin Island, a large island in Lake Nipigon, making Frith Lake a lake on an island in a lake. Frith Lake itself has a small islet.
There are three unnamed inflows, at the west, southwest, and east. The primary outflow is an unnamed creek at the northwest that flows to northwest Lake Nipigon, and then via the Nipigon River to Lake Superior.
The lake is part of the Lake Nipigon Conservation Reserve.