This route follows the course of the Nant Bochlwyd as it flows down from Cwm Bochlwyd.

It offers about 70m of scrambling up wet, slippery rocks and serves as a good approach to the Main Cliff of Glyder Fach, rather than taking the steep path beside the stream. Escape can be made at any time.

The rock is slimy in places and loose rock is present as the channel is rarely ascended. It is best climbed after a dry spell when water levels will be low. Begin at Ogwen Cottage and take the left hand path that leads to Cwm Idwal.

Soon take another left across boggy ground, heading for the Nant Bochlwyd. Where the path steepens walk down into the stream bed. Start on the right-hand side and after a few metres climb a step. Here cross to the left side and ascend easy-angled slabs beside the narrow water-shute. Higher up a waterfall is best passed on its left. Above this the stream is quite wide offering a variety of line.

One entertaining obstacle is a narrow water runnel in the middle of the channel. Ascend it or the small rib to its right. Soon the gradient eases as you enter Cwm Bochlwyd. From here approaches can be made to Tryfan (South Ridge), Bristly Ridge and the Main Cliff of Glyder Fach, or Y Gribin/False Gribin.