From an Islay walking week excursion to Jura back in 2005, the walkers are taking their lunch break above a waterfall close to Loch Tarbert (the loch is right behind the photographer).

 There are a few nice waterfalls on Islay’s neighbour Jura, this one is near the shore of Loch Tarbert. I’m not sure what it is called, but I believe it is fed by Abhainn Luindale.