| Indian River | |
| Pushpin Map: | Canada Southern Ontario |
| Pushpin Map Caption: | Location of the mouth of the river in southern Ontario |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Ontario |
| Subdivision Type3: | Region |
| Subdivision Name3: | Eastern Ontario |
| Subdivision Type4: | County |
| Subdivision Name4: | Lanark |
| Subdivision Type5: | Municipalities |
| Source1: | Unnamed lake |
| Source1 Location: | Lavant Township, Lanark Highlands |
| Source1 Coordinates: | 45.1756°N -76.6186°W |
| Source1 Elevation: | 319m (1,047feet) |
| Mouth: | Mississippi River |
| Mouth Location: | Ramsay Township, Mississippi Mills |
| Mouth Coordinates: | 45.2567°N -76.2422°W |
| Mouth Elevation: | 94m (308feet) |
| River System: | Saint Lawrence River drainage basin |
| Tributaries Right: | Union Hall Creek |
The Indian River is a river in Lanark County in Eastern Ontario, Canada.[1] It is in the Saint Lawrence River drainage basin and is a left tributary of the Mississippi River.
The river begins at an unnamed lake in geographic Lavant Township in the municipality of Lanark Highlands.[2] It flows east into geographic Darling Township, under Lanark County Road 511 near the settlement of White, turns southeast, passes the settlement of Halls Mills on the border of geographic Lanark Township, and reaches Clayton Lake, where it takes in the outflow from Taylor Lake. The river passes into geographic Ramsay Township in the municipality of Mississippi Mills on the lake, and leaves over the Clayton Lake Dam at the settlement of Clayton. It heads northeast, takes in the right tributary Union Hall Creek, and passes through the Mill of Kintail Conservation Area, which has a former grist mill, and a former home of medical doctor, sculptor and Ramsay Township native R. Tait McKenzie.[3] The mill is home to a museum to Mackenzie and to another famous native of Ramsay Township, inventor of basketball James Naismith.[4] The river then reaches its mouth at the Mississippi River, 1.4km (00.9miles) upstream of the settlement of Blakeney; the Mississippi flows via the Ottawa River to the Saint Lawerence River.