River Tay is Scotland’s longest river and Britain’s seventh-longest. It is also the largest river in Britain by volume of flow and one of the five big Scottish salmon rivers. The river springs in Ben Lui and changes its name a couple of times before it crosses through Loch Tay. By the time it touches the end of its sublime travel, it is almost 3.2 km (2 miles) large and can transport more water than the Thames and the Severn mixed together. River Tay is home to internationally significant populations of salmon, otter and lamprey and is ranked as one of Scotland's finest angling streams.