River Tay represents the longest in Scotland and ranked seventh-longest in Britain. It is also the largest river in Britain by volume of debite and one of the five big Scottish salmon rivers. This river starts life as a small rise on Ben Lui and changes its name a couple of times before it crosses by 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.