Strækningen syd for Huy, langs en lille biflod til Meuse, består dette enorme underjordiske system af to huler, Manto-hullet og St-Etienne-hulen. Komplekset er et vigtigt sted for flagermus-hibernation. I de seneste år er adskillige arter blevet identificeret som stærkt truede i regional skala, såsom den mindre hestesko-flaggermus (Rhinolophus hipposideros) og den scallopørede vespertilion (Myotis emarginatus).
For at gå tilbage ned, går vi først op for at komme rundt om Trou Manto til venstre. Når vi når toppen, følger vi stien til højre og går ned (flere stier krydser hinanden, men alle fører til bunden) mod floden.
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