The Asinara island lies off the north-west extremity of Sardinia separated by the Fornelli Passage. There are four groups of hills on the island of no great height, and the coast is everywhere rocky with low cliff. A national park since 1997, Asinara also became a marine reserve in 2003. The island has been in relative isolation for over a century. It has been a quarantine island, and in the first world war a "super-prison" for organised crime.