Lochs are large bodies of freshwater found primarily in Scotland. They are often formed by glacial activity and can vary in size and depth. The term "loch" is derived from the Scottish Gaelic word for lake, and it is commonly used to describe both lakes and sea inlets in the region. There are two main types of lochs: freshwater lochs, which are entirely surrounded by land, and sea lochs, which are partially open to the sea. Famous examples include Loch Ness, known for its legendary monster, and Loch Lomond, a popular destination for outdoor activities and scenic views.