The River Tay is the longest river in Scotland, flowing from the mountains of Perthshire to the Firth of Tay. The River Dee is a river in Aberdeenshire, Scotland, which flows through the Royal Deeside area and into the North Sea. The River DON is a river in Aberdeenshire, Scotland, which flows through the city of Aberdeen and into the North Sea. The River Esk is a river in Dumfries and Galloway, Scotland, which flows into the Solway Firth. The River Clyde is the second longest river in Scotland, flowing from the Southern Uplands to the Firth of Clyde.