Tournemire hiking circuit

This 1885 m long old railway tunnel was excavated towards the end of the 19th century. In 1988, a laboratory designed to undertake, geophysical, geomechanical and hydrochemistry studies was set up inside the tunnel. The aim of this fundamental research, carried out by the Nuclear Safety and Protection Institute, is to gain more knowledge of the way underground water moves and transports dissolved materials. It also examines the geological structure of the area. Some grey marine marl outcrops can be seen in the surroundings and are an equal mixture of clay and limestone.

Dry Grasslands which are iconic features of the caussenard landscape originate from pristine forests that have been transformed by human actions (land clearing, stubble-burning, farming and pasture). This ecosystem is a semi-natural environment with outstanding biological particularities: it provides a critical habitat for rare animal and plant species and is a perfect hunting ground for birds nesting in surrounding cliffs and gorges. Moreover, these traditional pastoral lands have been used for centuries. At the end of the spring season, the causses scenery is decked out with tall grass (feather grass) that forms the shape of a thick silver hair. (source PNR Grands Causses).

Ever since the Neolithic period, humans have kept on improving the numerous natural ponds that they came across all around the Causse. They took advantage of these small land depressions called sotch or doline that provided essential water supplies to ensure the sheep watering, but were also used as laundry places or fish ponds, although their clayey bottom have always posed problems with leakage.

In the Occitan language, the word lavanha refers to all kinds of ponds whether natural or hand built, whereas at the PNRGC, we have chosen to keep the word lavogne, or lavagne to designate ponds with paved bottoms, for they have witnessed the development of pastoralism over the 19th century. (source PNR Grands Causses).

The cliffs of the Tournemire amphitheatre are an important playground and nesting area for numerous birds. These cliffs are home to great variety of bird life, from the most expressive to the most secretive such as: the Rock Swallow; the Alpine Swift; the Red-billed Chough; the Wall creeper; Bats (Greater Horseshoe) and birds of prey nesting on cliffs among which is the Eurasian Eagle-Owl.

The House of Plesiosaur displays the skeleton of the marine reptile (it's a copy, the original is at Millau's museum) along with interpretative panels about the geology, Plesiosaur, flora, birds and bats. It is also the starting point of the Tournemire amphitheatre hiking circuit that enables you to immerse yourself in a unique environment and of the point of departure for the amphitheatre interpretive trail.

"Espace Nature Aveyron" is a mobile application which allows to discover the whole range of animal and plant species living in this ecosystem and to enjoy the SNS stroll.

Free mobile app « Balades des Grands Causses » available on IOS or Android

Duration of the tour: between 2 and 3 hours