So what is the difference between a loch and a lake? Well, the main distinction is where they are located. Lochs can be found in Scotland and Ireland whilst lakes are found elsewhere in the world. This is because the word 'loch' comes from the Gaelic languages which were historically used in these parts of Britain.

While the terms are often used interchangeably by visitors, the distinction between a "loch" and a "lake" is primarily linguistic, cultural, and geographical rather than a scientific difference in the water itself. "Loch" is the Scottish Gaelic word for a body of water, and it is used almost exclusively in Scotland and parts of Ireland (where it is spelled "lough"). In Scotland, practically every large body of standing water is a loch, with the "Lake of Menteith" being the only notable exception. Geographically, many Scottish lochs are "sea lochs," which are actually fjords or narrow inlets of the sea, whereas a "lake" is typically defined as an inland body of freshwater. Historically, the word carries a deep sense of national identity; to call Loch Lomond a "lake" would be seen as ignoring the specific Gaelic heritage of the Highlands. Scientists might classify them both as lacustrine systems, but in the context of British geography, a loch implies a specific glacial formation found in the rugged, peat-stained landscape of the north, often characterized by great depth and legendary folklore that a standard "lake" might not possess.