Richtis Gorge is a narrow ravine that develops within the lithological group of Phyllites-Schists of Crete. The rocks are of Carboniferous-Permian age (~360 million years) and consist of schists, gneisses, amphibolites, meta-igneous rocks, and a few marbles. The intense weathering of the rocks, and mainly their different resistance to it, create the peculiar relief of the ravine and the small waterfalls.
The geosite description is a result of the deliverable of the research project Joint Innovative Activities for Outdoor Tourism-JoinOut. The project entitled "Partnership of Innovative Rural Tourism Actions" and distinctive title: "JoInOuT", is implemented within the framework of the Action "Cooperative Innovation Formations/SCC" - 2nd Call: Businesses" and is financed by the European Regional Development Fund (ERDF) and by National Resources in the context of the Operational Program "Competitiveness, Entrepreneurship and Innovation (EPANEK)" of the NSRF 2014-2020" (Project code: ΓΓ2CL-0359457).