The Tay River is a river in Lanark County in Eastern Ontario, Canada. It is in the Saint Lawrence River drainage basin and is a left tributary of the Rideau River.CourseFor a map showing the river course highlighted on a topographic map, see this reference. This river starts at Bobs Lake and leaves the lake, controlled by a weir, near the community of Bolingbroke in geographic South Sherbrooke Township, part of the municipality of Tay Valley. It heads northeast, passes under Lanark County Road 36, reaches Christie Lake and passes there into geographic Bathurst Township. It continues northeast, passes under Lanark County Road 6, and divides into two channels; the right channel is known as Scotts Snye. The river then travels through the community of Glen Tay, continuing to Perth. The river splits into two main channels as it flows through downtown Perth. The two channels have recombined by the time it leaves Perth and continues to the Rideau River, which drains via the Ottawa River into the Saint Lawrence River.
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