- A walk full of surprises through woods, from one resurgent stream to another, along with the hamlet of Reyrevignes and its charming Romanesque church. In the Lot Département, the wide stretches of limestone and the chemical action of water on this has created a very characteristic relief. By analogy with the site of Karst, in Slovenia, the term of "karstic relief" is used. The Martel Causse, a vast limestone plateau, is marked by numerous circular depressions caled "dolines" which play the role of water-collectors. Rainwater filters down into the rock through fissures, cracks and galleries. It then feeds into small networks which in turn rejoin underground streams.