Loch Watten is a loch in the River Wick drainage basin in Caithness, Scotland. The name is a tautology, consisting of the word "loch" (of Gaelic origin) and vatn, a Norse word meaning the very same, found in such names as "Þingvallavatn" and Myvatn in Iceland, and "Røssvatnet" and "Møsvatn" in Norway.

It is well known as a good fly fishing loch for brown trout with the local village Watten being located to the south

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