Loch Katrine is a freshwater lake located in the Trossachs region of Scotland. It stretches approximately 13 kilometers (8 miles) and is known for its stunning natural beauty, surrounded by hills and forests. The loch is a popular destination for outdoor activities such as hiking, cycling, and boating. The lake is also historically significant, as it was famously featured in the works of the poet Sir Walter Scott. Additionally, Loch Katrine serves as a vital water supply for the city of Glasgow, with a reservoir at its eastern end that provides drinking water to the urban population.