Tay and Loch Lomond are two of Scotland's most famous lochs. Tay is the longest loch in Scotland, stretching over 60 miles from its source in the mountains of Perthshire to its mouth at the Firth of Tay. Loch Lomond is the largest loch in Britain, covering an area of over 71 square miles. Both lochs are popular tourist destinations, offering stunning views, a variety of activities, and plenty of wildlife.