flint of the Carixian age, forming russet cliffs oriented to the south-west. The hot springs were captured, since ancient times, to the point where these carixian limestones are cut by the hack of the southernmost valley, descending from Entrages. Their healing powers are linked to their ascent along the gypsiferous Triassic levels of the sole thrust of the Nappe de Digne. The most visible mountain of the commune is Le Cousson at ; the Bigué rises to . Many reliefs lie around Digne and are objectives for hikers. The Rocher de Neuf Heures [Rock of Nine o'clock] Three chapels (the Chapel of our Lady of Lourdes, the Chapel of Saint-Vincent, and the Chapel La Croix) The right bank of the Bléone (Park of the Haute-Provence Geological Reserve, along the Caguerenard path, paths to access the top of the slope (over above the town) and the crest of Andran - Martignon - La Bigue. Trails to access the Basses Bâties de Cousson, and then Le Cousson The Chapel of Saint Pancrace Barre des Dourbes IUGS geological heritage site In respect of its 'world famous and outstanding accumulation of fossils from a lower Jurassic marine environment', the International Union of Geological Sciences (IUGS) included the 'Ammonite Slab of Digne-les-Bains' in its assemblage of 100 'geological heritage sites' around the world in a listing published in October 2022. The organisation defines an IUGS Geological Heritage Site as 'a key place with geological elements and/or processes of international scientific relevance, used as a reference, and/or with a substantial contribution to the development of geological sciences through history.' Hydrography In the Eaux-Chaudes Valley, there is one cold and eight hot springs used for hydrotherapy. Some are radioactive, and contain sulfides, chlorobromides, and arsenic. The town is also crossed by the Bléone and the Mardaric rivers. Channels of communication and transport Road network Railway network The town is served by Chemins de fer de Provence via the Nice–Digne line, a narrow gauge line which operates daily. It is the Train des Pignes, which allows the railway to serve little inhabited places with many stations. Public transport Bus - Since 1992, Digne has the TUD (Urban Transport Digne), which manages the public transport. Initially with six buses, this service increased its vehicle fleet in 1998 with the acquisition of two buses powered by natural gas. Currently, six bus routes are available to the people of Digne. Natural