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Strath Nethy is a glacially enlarged valley based on a former water-cut valley, but subsequently its upper end was over-run by active ice moving across it at about 45 degrees to its course. The headwaters of the Nethy have therefore been captured by the Avon, visible beyond as Loch Avon. Some divergent ice would still have funnelled down Strath Nethy, and rocks would have fallen on it from the crags opposite, then to be deposited in blocky moraines in the valley floor. The moraines and the generally poor drainage (visible in the middle distance) make this the roughest path in the Cairngorms, in my opinion. The mountain in the centre is Cairn Gorm and on the far skyline is Ben Macdui, North top.