River Tay River Tay The River Tay () is the longest river in Scotland and the seventh-longest in the United Kingdom. The Tay originates in western Scotland on the slopes of Ben Lui (), then flows easterly across the Highlands, through Loch Dochart, Loch Iubhair and Loch Tay, then continues east through Strathtay (see Strath), in the centre of Scotland, then southeasterly through Perth, where it becomes tidal, to its mouth at the Firth of Tay, south of Dundee. It is the largest river in the UK by measured discharge. Its catchment is approximately , the Tweed's is and the Spey's is
Tay Canal one following the route of the First Tay Canal to Port Elmsley and a second involving a canal cut from Beveridge Bay of Lower Rideau Lake to the Tay River. To the disappointment of the residents of Port Elmsley, the second route was chosen. In 1883, a Federal government order-in-council authorized a contract with A.H. Manning & Macdonald Company for the construction of the Tay Canal. The proposal included deepening the entire system to the required depth; cutting a wide, long canal to Beveridge Bay; building two locks near the south end of the canal cut, each with a lift