The valleys of Santerno, Senio, Sintria and Lamone that furrow the Apennines in the western part of Romagna, are intersected, about ten kilometers from the line of junction with the plain, by the Vena del Gesso Romagnola.

It is a ridge of calcium sulphate, variously crystallized and stratified in imposing banks, which emerges for a length of about twenty kilometers and with a width that never exceeds one kilometer, crossing six municipalities including Riolo Terme.

The chalky-sulphurous formation has influenced the construction of the landscape that extends all around, favorably influencing the microclimate of the four valleys.

It is a natural and historical wealth that surprises and fascinates the hiker who walks along the paths of the Park.

Regional park of the gypsum vein