Tay River, the longest river in Scotland. From the source of its most distant headstream in the Grampian Mountains to its mouth, the Tay is about 120 miles (190 km) long. It flows through the Tayside region of east-central Scotland, drains Loch Tay, and empties into the North Sea at the tidal Firth of Tay.
Alps, a mountain system of central Europe. Its lofty ranges stretch in a rough arc from the Riviera on the Mediterranean coast, across southeastern France and northern Italy, through most of Switzerland, Austria, and Liechtenstein, and into southern Germany and Slovenia.