The Mach Loop is one of the most spectacular aviation spectacles in the world. RAF and allied fast jets — Typhoons, Hawks and F-15s among them — practise low-level flying through the deep valleys between Machynlleth and Dolgellau, appearing without warning over the ridge lines, dropping into the valley and gone within seconds. There's no fixed schedule: flying depends on weather and training needs and can change at short notice, so some days bring several passes and others none at all — weekdays are generally busier than weekends. The best-known viewing spots are Cad West, the most popular, with large layby parking on the A487 and a steady uphill walk to eye-level views of full valley passes; Cad East, a little higher and often quieter; Bwlch, a ridge viewpoint with broad sightlines across the valley; Corris Corner, lower down, where aircraft appear quickly through the bend; and the Corris Craft Centre, a flat, easy option where you can sometimes watch them pass overhead over a coffee. Bring binoculars or a zoom lens, park considerately in the designated laybys and be patient — it's extraordinary when it happens.
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