28m. Roughly follows the line of the rib that bounds the left side of the main Fence Buttress slab. Start below the fence in line with the upper rib. Climb the slabby lower pillar to easy ground. Scramble to the bulges and step right to below a groove. Follow the groove for a few moves until a ramp leads left on to the upper rib. Climb this and the slabs above to the top.