Cala Luna has no road. The beach that anchors every cala gonone to cala luna boat trip can be reached only by sea or on foot along the Codula di Luna, and that absence of asphalt has shaped it more than any building ever could. The cove sits inside the Gulf of Orosei, a forty-kilometre wall of Mesozoic limestone that rises from the Tyrrhenian without a single town along its length. Behind the sand, six sea caves stand open in the rock face, hollowed by wave action over millennia. Their floors are dry, their ceilings soot-marked in places. Shepherds and fishermen used them as shelter long before tourism existed. The Supramonte massif rises above, and the Codula di Luna canyon empties here after nineteen kilometres of dry riverbed, depositing the pale gravel that gives the beach its coarse texture. The wider coastline holds Grotta del Bue Marino — the Sea Ox Cave — named for the Mediterranean monk seal that bred in its galleries until the 1980s. Neolithic engravings were recorded on its walls. Further south lie Cala Mariolu and Cala Goloritzè, the latter formed by a rockslide in 1962 and now a national monument, its limestone pinnacle rising ninety-eight metres above the shore. Cala Luna itself was declared part of the Gennargentu National Park protection zone, and photographers have worked the cove since Michelangelo Antonioni filmed sequences here in 1964. What makes the site matter in 2026 is that its inaccessibility has been formalised rather than solved. Entrance to the beach remains free — 0 EUR — because there is no gate to charge at. Access is the commodity instead, sold by the operators who run cala gonone to cala luna boat trip tours out of the marina below the cliffs of Dorgali. The distinction is worth understanding: a Gulf of Orosei coastal cruise and a dinghy adventure to Cala Mariolu and Cala Goloritzè reach different coves at different speeds, and the choice of vessel determines how much coastline a visitor actually sees. The geology repays attention. The rock is Jurassic dolomitic limestone, karstified, riddled with the drainage systems that produced both the caves and the canyon. Water enters green over sand and turns cobalt over depth within metres of the shore. Junipers grow directly from fissures in the cliff. The cove is legally addressed at Cala Luna, 08022 Dorgali NU, Italy, though no structure there carries a number.