The Fondal de Valldellós was formed by the collapse of a limestone cliff that has created an exceptional chaos of blocks, among which a multitude of small concavities of little speleological value but archaeological interest have taken shape. The site is dominated by two singular elements: the needle of Valldellós, a monolith that presides over the hollow, and the pass of the thieves or of the fox, which, forming a concealed channel, allows the cliff to be easily surmounted. Characterized archaeologically as a cave hermitage-cultural nucleus, it is a spot resulting from the decomposition and retreat of the cliff where a tumbling of blocks creates a small labyrinth of passages and dens. The Cova de la Jeta is located not far from the Pas dels Lladres, heading toward the Agulla de Valldellós. The two entrances are separated by about 25 m from one another.