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We did the walk over three days - Friday night to Derry Lodge where we camped, Saturday in the hills with another night camping near Derry Lodge, and Sunday out again. The walk starts easy on a long track along the River Lui up to Derry Lodge. There is excellent wild camping in the area, and a bothy nearby too (which was closed because of covid). The walk up to Beinn Bhreac has some boggy bits but the ascent is fairly gentle and the path decent. Between the top of Beinn Bhreac to Beinn a' Chaorainn is a challenging plateau which took longer than expected and left us pretty tired before the ascent up the second peak. The next ascent is a challenge too, navigating through a field of rocks and boulders. There are no paths on those two sections, so make sure to have something to navigate by! The views are stunning though, and as always worth the struggle
We lost the path a few times going down but it's not too bad a descent, some rocky bits to get over with quickly and then quite soft ground - easy on the knees! The path down meets the long track back into Glen Derry. It's a long stretch that goes gently down the valley. We walked it on a sunny day and saw an adder very close (it slithered right past my knee while we were having a break). The path goes along the river for some distance and there are plenty of beautiful spots for swimming or dipping sore feet in. I would highly recommend camping on a dry day if the distance of the walks is too intimidating to do in one go. Nothing like whiling away an evening in a beautiful valley under pine trees, watching the river and the clouds float by.
