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.

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Indian River
Indian River at the Mill of Kintail Conservation Area
Location of the mouth of the river in southern Ontario
Location
Country	Canada
Province	Ontario
Region	Eastern Ontario
County	Lanark
Municipalities	Mississippi Mills Lanark Highlands
Physical characteristics
Source	Unnamed lake
• location	Lavant Township, Lanark Highlands
• coordinates	45°10′32″N 76°37′07″W
• elevation	319 m (1,047 ft)
Mouth	Mississippi River
• location	Ramsay Township, Mississippi Mills
• coordinates	45°15′24″N 76°14′32″W
• elevation	94 m (308 ft)
Basin features
River system	Saint Lawrence River drainage basin
Tributaries
• right	Union Hall Creek

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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, 1.4 kilometres (0.9 mi) upstream of the settlement of Blakeney; the Mississippi flows via the Ottawa River to the Saint Lawerence River.

• Union Hall Creek (right)

• List of rivers of Ontario