This is the highest waterfall in the Brecon Beacons National Park and is tucked into a narrow valley. The path down is steep and after crossing the bridge at the bottom there are a series of wooden stairways taking you to the waterfall itself. When you arrive at the falls just let your mind forget that you have a similar climb to get back to the car - you are likely to have this little corner all to yourself so lean against a willing tree and enjoy the atmosphere. Apparently you can walk behind the falls but I am certainly not suggesting that you should do so!