Firth of Tay Firth of Tay The Firth of Tay (Scottish Gaelic: Linne Tatha) is a firth in Scotland between the council areas of Fife, Perth and Kinross, the City of Dundee and Angus, into which Scotland's largest river in terms of flow, the River Tay empties. The firth has a maximum width of at Invergowrie. Two bridges span the firth, the Tay Road Bridge and the Tay Rail Bridge. The firth has one major island, the marshy Mugdrum Island. The Firth of Tay in Antarctica was discovered in 1892-93 by Captain Thomas Robertson of the Dundee whaling expedition and named by him
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