I have explored now for about 3+ days with my boat, exiting when I see landmasses that look like they would house apple trees (basing my info on the ring of brodgar entry on apple trees).
I mean, I am on amber client, and the trees should pop up on the minimap because I've enabled only apple trees to be shown... I haven't found one single apple tree so far.
But for real, am I just unlucky, or is there a serious lack of apple trees in this world?