| Gardiner River | |
| Pushpin Map: | Ontario |
| Pushpin Map Caption: | Location of the mouth of the Gardiner River in Ontario |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Ontario |
| Subdivision Type3: | Region |
| Subdivision Name3: | Northeastern Ontario |
| Subdivision Type4: | District |
| Subdivision Name4: | Cochrane |
| Source Confluence: | Confluence of two unnamed streams |
| Source Confluence Location: | Lambert Township |
| Source Confluence Coordinates: | 50.4881°N -82.1078°W |
| Source Confluence Elevation: | 84m (276feet) |
| Mouth: | Mattagami River |
| Mouth Location: | Gardiner Township |
| Mouth Coordinates: | 50.6978°N -81.53°W |
| Mouth Elevation: | 33m (108feet) |
| River System: | James Bay drainage basin |
The Gardiner River is a river in Cochrane District in northeastern Ontario, Canada.[1] It is in the James Bay drainage basin, and is a left tributary of the Mattagami River. The river lies between the Mattagami and the Missinaibi River just upstream of the confluence of those two to form the Moose River, which flows to James Bay.
The river begins at the confluence of two unnamed streams in geographic Lambert Township[2] and flows northeast through unplatted Cochrane District, then geographic Gentles Township[3] to reach geographic McCuaig Township.[4] It turns east, flows through geographic Mulholland Township,[5] then into geographic Gardiner Township[6] and reaches its mouth at the Mattagami River.
Other map sources: