There are plenty of sheep in Iceland and the modern day sheep is a direct descendant of the sheep brought in by the viking settlers during the 9th and 10th century. It is illegal to import sheep from anywhere else today so the breed is kept pure.
In summer the sheep are released for free range grazing in the mountains and highlands, of course all the sheep get mixed up and at fall they are rounded up and herded into a central corral where all the farmers come and select their sheep and place in pens to then take to the barns for winter, this is called Réttir.
Ross and Olga arrive in Iceland on Thur 16th Sept just in time for them to help Olga's uncle in the second Réttir for the season. Ross really enjoyed it the last time and is very much looking forward to picking up where he left off, he seemed to have a natural ability which impressed the uncle who was surprised that Ross did not come from a farming background. My daughter-inlaw Olga has a good description and explanation of the 2008 event here and I am sure more photos will pop up on her blog after they have joined in all the fun again this year.
This video demonstrates the herding of the sheep into the central corral.
This one shows a farmer in the central corral selecting his sheep and dragging to his pen.