I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission not required.
Blaen y Glyn waterfall is within Talybont Forest in the Bannau Brycheiniog (Brecon Beacons) National Park.
You can walk to Blaen y Glyn waterfall from either of two car parks - Blaen y Glyn Isaf is the lower car park and Blaen y Glyn Uchaf is the upper car park - the location mapped here is the lower car park.
The walk up to the beautiful waterfall takes about 20 minutes - there are plenty of other waterfalls in the area, but most have extensive tree cover that make flying a drone challenging
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 21/03/2025. It remains the responsibility of any pilot to check for any changes before flying at the same location.