During the two last decades, numerous inventories of geosites have been carried out at various scales. They aim at documenting the state of the geological heritage, which is the basis for management strategies. In very humanized regions, where the original geomorphology has been highly modified by human infrastructures, agriculture, urban sprawling, and various modifications of landforms, it is important to inventory not only the landforms visible today but also former landforms destroyed or hidden by human activities. To address the issue of inventorying invisible geomorphosites, two approaches were tested in the Rhone River valley (Switzerland). The first was an inventory of geomorphosites of the study area. Not only the visible landforms but also the landforms that had completely disappeared were evaluated with the assessment method of the University of Lausanne. A total of 28 geomorphosites were assessed including five missing sites (two sand dunes areas, a braided sector of the Rhone River and two former marshes). These invisible geomorphosites were assessed and their management was discussed. The second study was a multi-method analysis of former landscapes of the 19 th century. Several data including historical maps, written archives, digital terrain model and iconographic sources were combined and allowed the reconstruction of palaeolandscapes and landforms. Both materials allowed proposing a strategy for geotourism development.
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The project InterGEO was carried out with the objective to disseminate knowledge on geomorphological heritage by developing a digital learning platform. It aims at improving students' autonomy by the reduction of face-to-face teaching and increasing autonomous learning as well as promoting international interactions between students interested in geomorphological heritage. A completely free-access virtual course on geomorphosites was developed with the Learning Management System Moodle. The course is divided into 24 thematic chapters, each of them containing a short description, a list of references and selected publications, as well as other educational material (videos, virtual fieldtrips, etc.). In particular, several videos allow presenting in a dynamic way concepts and examples. The paper presents the tool and its use in academic programmes in six European universities, where it was tested, in various contexts (Bachelors' and Masters' programmes; students in geography or geology; general courses in geomorphology and specific courses on geoheritage and geoconservation), before discussing the advantages and challenges the tool is facing. The InterGEO platform is an easy-to-use and friendly educational tool, which allows developing blended learning activities; it is flexible and adaptable in various learning contexts.
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