The conditions that restricted the establishment of human settlements on Montecristo have favoured the preservation of its flora and fauna. Animals and plants once found throughout the
Mediterranean still live on the island. Of particular interest are the giant
heather formations covering the valley floors and several thousand-year-old
oaks that manage to survive at the highest altitudes. Also interesting are the Montecristo viper (
Vipera aspis hugyi, a subspecies also present in southern Italy, and today considered introduced by humans) and
Discoglossus sardus, an
amphibian found only in a couple of islands in Tuscany and Sardinia. An
endemic subspecies of
lizard,
Podarcis muralis calabresiae, thrives on the island. The state nature reserve
Isola di Monte Cristo is a biogenetic reserve of 1,039 hectares established in 1971 by ministerial decree to protect the unique nature of the island. and recognized as a site of pan-European interest. Visitors face a number of restrictions. It is not possible to stay overnight, and swimming, and surfing are prohibited within 1 kilometer of the coast. It is possible to cruise within three miles () of the coast, but fishing is not allowed. Access by sea is possible only at Cala Maestra (where the seabed is sandy) and with an approach course perpendicular to the coast; it is possible to dock at the pier or tie up against a buoy, but dropping anchor is not allowed; there is also a small heliport for emergencies. To visit the island, one must apply for access at the Forestry Corps in Follonica. Visitors with basic authorization must stay at Cala Maestra, and can visit only the Royal Villa, the botanical garden, and the museum. The waiting list for access is long, since the limit for visitors has been set at only 1,000 per year. The average waiting time for approval to visit is three years, and priority is given to scientific expeditions, associations, and schools. Tours take place only on three existing trails, all of which are very challenging. ==Landmarks==