Which is the only body of water in Scotland to be called a lake as opposed to a loch?
Loch water – for example, the Loch Sloy scheme, and Lochs Laggan and Treig (which form part of the Lochaber hydroelectric scheme near Fort William). Other expanses are simply called reservoirs, e.g. Blackwater Reservoir above Kinlochleven. Scotland has very few bodies of water called lakes. The Lake of Menteith, an Anglicisation of the Scots "Laich o Menteith" meaning a "low-lying bit of land in Menteith", is applied to the loch there because of the similarity of the sounds of the words "laich" and "lake". Until the 19th century the body of water was known as the "Loch of Menteith". The Lake
Perennial water specifically include those that only are perennial except in years of severe or unusual drought. Perennial standing (lentic) water is usually called a lake or a pond, but there are several local or dialect English words for such features. Examples include mere, tarn, loch or fen. Each has a special meaning, though modern usage tends to be loose. Vlei is a foreign example that may or may not mean a perennial body of water, but more often than not refers to a seasonal pond. Perennial water Perennial water body usually refers to mainly liquid fresh water, as opposed to sea