River Tay Dochart until it flows into Loch Tay at Killin. The River Tay emerges from Loch Tay at Kenmore, and flows from there to Perth which, in historical times, was its lowest bridging point. Below Perth the river becomes tidal and enters the Firth of Tay. The largest city on the river, Dundee, lies on the north bank of the Firth. On reaching the North Sea, the River Tay has flowed from west to east across central Scotland. The Tay is unusual amongst Scottish rivers in having several major tributaries, notably the Earn, the Isla, the River Tummel, the Almond and
River Tay froze over as far as the Tay Road Bridge, and ice floes remained for weeks despite a thaw. Several places along the Tay take their names from it, or are believed to have done so: The river is of high biodiversity value and is both a Site of Special Scientific Interest (SSSI) and a Special Area of Conservation. The SAC designation notes the river's importance for salmon ("Salmo salar"), otters ("Lutra lutra"), brook lampreys ("Lampetra planeri"), river lampreys ("Lampetra fluviatilis"), and sea lampreys ("Petromyzon marinus") . Tha Tay also maintains flagship population of Freshwater pearl mussel ("Margaritifea margaritifera"). Freshwater pearl