It is situated at the confluence of the Bastareny and Llobregat rivers in the north of the comarca.

It is an important local commercial centre, and for this reason has been less affected by depopulation than other municipalities in the Berguedà.

It is open to the public in guided groups, which descend approximately 340 metres into its depths, to see its extensive galleries, which still drip petroleum from the rock walls and experience the strong smell associated with fossil fuels.

It is one of the few underground petroleum mines in the world, an exceptional historical curiosity from the industrial revolution in Berguedà.

In order to preserve and protect its wealth of fauna (Pyrenean newts, salamanders and bats), some parts of the mining installations have been excluded from the tourist access.