This is a circular walk of about 9 miles to the summit of Tal y Fan from the small car park on the Sychnant Pass road.
(right-click the Download button to save the GPX).
You can view route reports (when available) here: Route Reports for Tal y Fan.
*Disclaimer: The information on this page is intended only as a guide to the route. You should always take the relevant map and a compass with you and check weather conditions before setting out. The grading of routes is from my experience of them and may differ to your expectations.
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