Close Mike but not close enough, very close Peter but still not close enough
I think,
Mike Hamish, it's the actual make up of the ground (inc vegetation and plant species?) that's used in this location to qualify as Tundra??? What i was informed anyway.
Give it that the area is very exposed to an almost continual blast of wind is the deciding factor and, along with the poor (and thin) soil content here, is what's shaped it this way.
No more clues except to say it's certainly on a northern isle.
By the way Hamish
Mike the treeline in Orkney is on the mainland, just along from Finstown in a small glen allowing enough shelter for them to get a hold. There is another called Happy Valley close by but i think this is entirely man made and certainly maintained.
Oh and the collective name for these islands is Orkney, or Shetland, not the Orkneys and Shetlands. And they tend to put the Waters name before description, IE Harray Loch, Swanney Loch, Spiggie Loch etc. I know this as i've been corrected enough times up there.