In reply to Gordon Stainforth:
I disagree on a few points.
The UK as a whole is the 51st (ish) most densely populated country in the world. Hardly qualifies as one of the most densely populated. And if you take Scotland as the parent country it is around 188 out of 241 countries. So really not heavily populated at all.
The lake in question is a loch.
My reply to Rigid Raider had no bearing on my original question.