Tryfan may also be climbed by the south ridge, which links the mountain (via Bristly Ridge) to Glyder Fach. The route begins at Bwlch Tryfan, the col between Tryfan and Bristly Ridge. The col is reached by a path leading up from Idwal Cottage to the west, passing through Cwm Bochlwyd. This cwm contains Llyn Bochlwyd.