The Mahon falls is a waterfall near Mahon Bridge (county Waterford) in the Republic of Ireland.
When driving from Dungarvan to Lemybrien (road N25), there take the exit to Mahon Bridge and the Comeragh Mountains (R676). There take the exit left to “the Comeraghs” and “Mahon falls”. Follow the signs to the parking, there another right turn. The trailhead lies at the parking (gps 52.223682, -7.541210).
A roundtrip to the Mahon falls (waterfall trail) takes a little over an hour (4 kilometer) with an elevation of 300 meter. The waterfall trail starts ascending till the top of the hill and descends at the waterfall.
You also can choose the easy trail and stay near the river with a minimal ascend. This is also much shorter and faster.
Probably the Mahon falls (a series of cascades) is the highest waterfall in the Republic of Ireland with a total height of 110 meter but Internet figures say the waterfall is only 80 meters high.