River Tay

River Tay Tatha
Looking upstream (north) along the Tay from the centre of Perth. In view are St Matthew's Church and Perth Bridge
Location
country	Scotland
State	United Kingdom
Physical characteristics
Source	Allt Coire Laoigh
• location	Ben Lui, Stirling council area / Argyll and Bute, Scotland
• coordinates	56°23′07″N 4°47′36″W / 56.38528°N 4.79333°W / 56.38528; -4.79333
• elevation	720 m (2,360 ft)
Mouth	Firth of Tay, North Sea
• location	Between Perth, Scotland and Dundee, Scotland, UK
• coordinates	56°21′18″N 3°17′54″W / 56.35500°N 3.29833°W / 56.35500; -3.29833
• elevation	0 m (0 ft)
Length	193 km (120 mi)
Basin size	4,970 km2 (1,920 sq mi)
Discharge
• average	220 m3/s (7,800 cu ft/s)
Basin features
Tributaries
• left	River Lyon, River Tummel, River Isla
• right	River Almond, River Earn, River Braan

The River Tay (Scottish Gaelic: Tatha, IPA: [ˈt̪ʰa.ə]; probably from the conjectured Brythonic Tausa, possibly meaning 'silent one' or 'strong one' or, simply, 'flowing'^[1]) is the longest river in Scotland and the seventh-longest in Great Britain. The Tay originates in western Scotland on the slopes of Ben Lui (Scottish Gaelic: Beinn Laoigh), 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 United Kingdom by measured discharge.^[2] Its catchment is approximately 2,000 square miles (5,200 square kilometres), the Tweed's is 1,500 sq mi (3,900 km²) and the Spey's is 1,097 sq mi (2,840 km²).

The river has given its name to Perth's Tay Street, which runs along its western banks for 830 yards (760 metres).