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Henrhyd Falls Waterfall €“ The Batcave Entrance!. Henrhyd Falls - Situated On The River Nant Llech And With A Drop Of 90Ft Or 27M Over A Hard Edge Of Sandstone Known As Farewell Rock It Is The Highest Waterfall In Southern Wales. It Is Possible To Walk Behind The Curtain Of Water Which Doubled As The Entrance To The Batcave In The Film Dark Knight Rises.