The link you followed will bring you to this page:

https://www.balcanicaucaso.org/aree/Croazia/Plitvice-la-cura-di-un-parco-221914?fbclid=IwAR2kLdUNA-uI20zhNXGJplbBONU75S6DtKJ__VYATei0qQsQLk9hGdba0r8