The Géologique de Haute-Provence National Nature Reserve (RNN73) is a national nature reserve in Provence-Alpes-Côte d'Azur. Established in 1984, it covers 269.316 hectares over 18 sites in the Alpes-de-Haute-Provence and Var. Located between the Verdon and Durance rivers, it is a labellised area for its landscape diversity, witness of the geological past of the Earth. It is the largest geological reserve in Europe.