In the heart of the Barbagia di Seulo region, in the territory of Sadali, a small inhabited area between the provinces of Cagliari and Nuoro, an ancient legend enshrouds a lush forest of holm oaks. On the border with the territory of Seulo, a short distance from Su Stampu 'e Turrunu, a 16-metre high waterfall (which should absolutely not be missed) that jets out from a rock, Is Janas is hidden in the luxuriant vegetation. Enshrouded in an aura of mystery the caves, which are 240 metres long, bring to mind ancient fairy-tales and their protagonists, the fairies. It is said that they lived far from prying eyes, preparing delicacies and sweets, and that they were turned to stone by God for having killed (and mocked) an old friar.

The underground cave now contains a very precious natural treasure and unusual wildlife. It is divided into six rooms and there are a few steps leading to the vestibule, which is a large slightly sloping room where unusual stalagmites grow drop after drop, covered by a plant patina. As you go further inside, you will enter the S' Omu de is Janas, the house of the fairies. In this oval room, which is 25 metres long and 8 metres wide, you will find the Janas that - according to legend - have become three impressive stalagmites. Flows, columns and marble drapery make it an enchanting place. From the ceiling, a flurry of white stalactites will dazzle you. After going past the room of the "ancient landladies', you will reach Su Mulinu, the third room with a massive ochre-coloured flow. Nearby, there is a small stalagmite that brings to mind a Madonna with child. The next room is Su Longu, a bare corridor on the floor of which you can admire low columns that overlook a small lake. From here, you will enter the Bridge, a strip of rock that leads to the last room, the room of the Guano: a dense colony of bats has made it their shelter. The cavernicolous wildlife is, in fact, typical in the cave: molluscs, centipedes, spiders, pseudoscorpions, lepidoptera, various types of insects and eutroglophile salamanders are the inhabitants of a place where time stands still.

Sadali is a picturesque medieval village located at an altitude of 750 metres that developed around the Late Byzantine parish of San Valentino. Next to the church, you can admire a waterfall, the waters of which fall into the gulf of Sa Bucca manna (the great mouth). The village is surrounded by forests of holm oak, durmast and cork oaks: not far way, it is worth paying a visit to the Accodulazzo nuraghe, where prehistoric fragments of obsidian and pieces of pottery from the Roman period were found, and the ancient water mill.