To reach Loch Morlich take the B970 east from the southern end of Aviemore, beyond Coylumbridge. The route starts at the western end of Loch Morlich where a forestry track runs south from the road. It leads to a bridge over the River Luineag. Cross the bridge and continue along the track, keeping straight on where another track heads off left. About a mile further on, another track heads off to the right, but keep to the left fork, signposted for Rothiemurchus Lodge.
The track climbs up towards the lodge. Just before it, turn right on to a clear track which leads up to a reservoir. Soon another track heads off to the right signposted for the Lairig Ghru. Follow this path through heather moorland. The path then heads left, climbing up through open moorland to the lip of the glen. The entrance to the Lairig Ghru is straight ahead.
After about a mile, as the hills begin to encroach on either side, a rough path almost doubles back to the left. Follow this path up the slope to the gap between Creag a' Chalamain and Creag an Leith-choin. The deep gully, the Chalamain Gap, is filled with huge boulders and requires great care when clambering through it. Beyond the gully a path leads through heather and pine saplings, dropping down to the side of a burn, then climbing up on the other side of the burn. Continue on this path, which then drops steeply down to the side of the burn. Cross the footbridge and climb the slope beyond to reach the main road. Turn left along the road to return to the start of the route.