Not far from Cala Sisine appears Cala Biriola with its distinctive natural rock arch.

This earthly paradise is situated under a dense wood which hides the charcoal burners’ old paths and tracks. Still today, you can find the traces of that hard business. In fact, scanning the cliff with attention, you can still notice the remains of the rails which were used to transport the coal to the beach where it was loaded on sailing ships.

The colours of the sea and the transparency of the waters are unique in the Gulf; it’s a shade of azure that makes you think of a swimming-pool. The sand of the beach is fine and white.

Snow-white rocks rise up from crystal-clear water to create an attractive natural scene in this cove a short distance away from Mariolu.

Due to its beauty and the integrity of its environment, this extraordinary bay has been declared a Natural Monument of the Region of Sardegna by a regional decree. It is famous for its wonderful limestone arch rising straight from the sea and for its needle or sugarloaf – a 100 metres high limestone monolith of extraordinary beauty towering above the little bay.