The River Tay (Gaelic: Tatha) 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 (Beinn Laoigh), then flows easterly across the Highlands, through Loch Dochhart, Loch Lubhair 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 volume of discharge. Its catchment is approximately 2000 square miles (the Tweed's is 1500 sqmi (3885 km2) and the Spey's is 1097 square miles).
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