La Coma I la Pedra is a municipality in Solsonès, located north of the Lord valley, at the head of the Cardener river. It is a village with plenty of water, there, we find the headwater of the Cardener river and the medicinal waters of the Puda fountain.
Near the small village of la Pedra, close to the Cardener river, with find the fountain of sulphurous waters called Puda, of great medicinal value. Since time immemorial it has been visited often by people of different origin and social status hoping to restore their health.
The first documented population centre is that of la Pedra. The la Pedra village is raised on a hill that dominated the Lord valley and it is here that we find the church of Sant Serni (Saint Saturnin), consecrated in the second half of the 9th century. This Romanesque church, very altered, has a single nave, covered with barrel vault and a marked transept, and faces East. It has two lateral chapels dating back to the 16th and 17th centuries, a 17th century Baroque altarpiece and a subchoir with moulded plaster decorations.