I have a similar venue here in Cornwall called Siblyback Lake. It has a track around the lake which they state is 5km but it is just a bit short of that. Fantastic place to run/jog around though does get quite breezy even on a fairly calm day. But the views are worth it.
I know what you mean. I love running around a loch; there's something special about it. I have several lochs lined up for this summer, for when I can easily manage 10-15km off-road (not too rough, as they are on forest track). I've also go one route sussed that I'd like to do sometime that is running around an island! The track around the whole island is just 10km!
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