Largest water bodies in the United Kingdom Lough Neagh is the largest water body in the UK by this measure, although Loch Ness is the largest by volume and contains nearly double the amount of water in all the lakes of England and Wales combined. Loch Morar is the deepest of the UK's lakes and Loch Awe the longest.

In a strict linguistic sense, England does not have "lochs," as that term is specific to Scottish and Irish Gaelic. In England, large bodies of water are almost exclusively referred to as "lakes," "meres," or "waters." The most famous examples are found in the Lake District, such as Windermere (technically a "water") and Coniston Water. However, there are some rare exceptions in Northern England near the Scottish border where local dialects or historical naming conventions use the word "Lough" (pronounced similarly to loch), such as Black Lough in Northumberland. While they are geographically similar—both being inland bodies of water or sea inlets—the distinction is purely a matter of regional identity and Celtic heritage. If you ask a local for the nearest "loch" in the middle of the English countryside, they will likely point you toward Scotland, which is home to over 30,000 lochs, including the world-famous Loch Ness and Loch Lomond.