Olta is famous for being on the inside cover of the RockFax. It only has 22 routes listed. But the pick of the bunch is Tai Chi 6b+ which goes up the blunt arete, and Tufa Groove 6b+ which runs up the tufa dripping corner. Si Maria at 7c is also worth of mention, perhaps onsightable for the strong.
There are many new lines to the left of the crag. These newer routes are mostly very easy lines which are broken by ledges. If you are going to climb on these new routes it may be prudent to carry some wires.