The River Dee is a river in Scotland that flows from the Cairngorms to the North Sea. The River Esk is a river in Scotland that flows from Langholm to the North Sea. The River Doon is a river in Scotland that flows from Loch Doon to the Firth of Clyde. The River Spey is a river in Scotland that flows from the Monadhliath Mountains to the Moray Firth. The River Clyde is a river in Scotland that flows from the Southern Uplands to the Firth of Clyde.