Scandola is a volcano that stopped erupting roughly 250 million years ago and has been eroding into the Mediterranean ever since. Its rhyolite and porphyry cliffs, stained ochre and oxblood by iron, drop straight into water that reaches 60 metres deep within a few boat lengths of the rock. The reserve occupies the northern arm of the Gulf of Porto, on the western flank of Corsica. There are no roads into it. A scandola boat tour from calvi remains one of the few lawful ways to see the peninsula at close range. France declared the area a nature reserve in December 1975, protecting 919 hectares of land and 1,000 hectares of sea. In 1983 UNESCO inscribed it as World Heritage alongside the Calanques de Piana and the Gulf of Girolata. Entry itself carries no charge — the posted fee is 0 EUR — because the reserve admits no independent visitors on foot. Access runs through licensed operators, and the water is open daily from 08:00 to 18:00. The official address is Scandola Nature Reserve, 20147 Osani, Corsica, France, though no visitor ever arrives by that route. What the reserve protects is easier to list than to see. Ospreys nest on the cliff ledges; the Corsican population, once reduced to three pairs, recovered here under protection. Cormorants, peregrine falcons and audouin's gulls share the same faces of rock. Below the surface, Posidonia oceanica meadows stabilise the seabed and shelter grouper and moray. Sea caves cut into the tafoni — the honeycomb weathering that pits Corsican stone into hollows and arches — and organ-pipe columns rise where cooling lava fractured into vertical prisms. Girolata, the hamlet at the reserve's southern edge, has no road either. Some fifteen residents winter there beneath a Genoese watchtower raised in the sixteenth century, supplied by boat or by a mule path from the Col de la Croix. Réserve naturelle de Scandola en bateau is, for most travellers, the only practical introduction to both. The Calvi departure adds the Baie de Nichiareto and the Punta Muchillina headland to the itinerary, tracing a coastline that has resisted development for fifty years. Pressure has grown regardless. Visitor numbers and boat traffic prompted UNESCO scrutiny and tightened operating rules across the last decade, and cave entry restrictions now apply in places. The scandola boat tour from calvi tours that run today do so under quotas designed to keep the ospreys nesting. The reserve endures because it is difficult to reach — and that difficulty is the point.