You'll never get this one

[Silkie]

Whereisit?

[MikeMonty]

Looks Inland, freshwater big enough for pocket cruisers, Loch Lomond? Can't quite work out the topography. I would have said somewhere like Ross Priory (years since I used to kayak up to there and thereabouts) but the stretch of water looks too narrow, though this might be down to lens focal length.
I'm just guessing really!

[Clyde_Wanderer]

Would it be looking west from ST fillans on loch Earn?

[Pete Cooper]

Is it the trout pond in the grounds of Chateau Silkie?

[Fingal]

St Mary's Loch?

[Silkie]

A virtual coconut for Border Maid!

St Mary's Loch Sailing Club was where it all started for me.

[Fingal]

I thank you. I thought those hills looked familiar; I have never sailed on the Loch but have ridden a motorcycle around it a good few times.