Polyaigos

Polyaigos is the largest uninhabited island in the Cyclades, a rugged 18-square-kilometre landmass lying between Kimolos, just 2 kilometres to its northeast, and Milos, about 6 kilometres to the east. Its name comes from the Greek for “many goats,” and free-ranging herds are still the island's only permanent residents — livestock belonging to herders from the surrounding islands, who lease grazing rights from the Greek Orthodox Church, the island's principal landowner. Two rocky peaks, Stroggylo and Psilo Vouno, rise to around 330 and 370 metres respectively, giving the otherwise barren, wind-scoured landscape its shape.

Cliffs, Caves and Turquoise Coves

Despite the harsh terrain, Polyaigos's coastline hides some of the more striking scenery in the Cyclades: sea caves, sheltered coves and beaches concentrated mainly along the southern shore, where the water turns a vivid turquoise over pale sand and rock. The island's volcanic geology, shared with neighbouring Milos, accounts both for the colour of the cliffs — which run through whites, pinks and dull reds — and for the abundance of natural rock shelters along the shore. Administratively Polyaigos belongs to the community of Kimolos, although nobody lives on it and there is no settlement of any kind.

Monk Seals and Eleonora's Falcons

The surrounding waters are an important refuge for the Mediterranean monk seal (Monachus monachus), one of Europe's most endangered marine mammals, which uses the island's sea caves for shelter and for raising pups. That is a large part of why Polyaigos and its coastal waters have been recognised under the EU's Natura 2000 network of protected sites. The island is additionally designated a Special Protection Area for Eleonora's falcon (Falco eleonorae), a long-distance migrant that nests late in the season on Aegean sea cliffs and times its chicks to the autumn passage of small migrating birds. Reptiles and wild goats fill out a fauna list that is short but disproportionately important.

Nine Thousand Stone Tools

The word “uninhabited” turns out to describe a recent condition rather than a permanent one. In 2022 the Small Cycladic Islands Project — a survey that has covered 87 uninhabited islands in the southern Aegean since 2019, working with the Norwegian Institute at Athens and the Cyclades Ephorate of Antiquities — turned its attention to Polyaigos, combining island-wide lidar analysis with drone survey and systematic fieldwalking on the ground. The team collected and studied more than 9,000 chipped stone artefacts, and recovered pottery ranging from the Neolithic period through to the very recent past, along with a substantial Bronze Age settlement at Benardou. Their conclusion was that Polyaigos saw nearly continuous, if small-scale, occupation from the Neolithic onward — a marked contrast to the patchier histories recorded on the smaller islands nearby, and evidence that island size shaped who could hold on and for how long.

Protected in Full

Those findings had a direct consequence. On 3 September 2025 Greece's Central Archaeological Council approved the designation of the entire island as an archaeological site, a decision announced by the Ministry of Culture and covering the underwater remains in Sykia Bay as well as everything above the waterline. The move followed pressure from the Milos chapter of ELLET, the Hellenic Society for the Environment and Cultural Heritage, which had raised the alarm over plans pointing towards construction on the island. Between the archaeological designation and the existing Natura 2000 status, Polyaigos is now among the most comprehensively shielded pieces of ground in the Cyclades.

With no ferry service and no permanent population, Polyaigos is reachable only by private or chartered boat, which is exactly what makes it a popular stop for gulet charter guests exploring Greece in search of an untouched anchorage between Milos and Kimolos. Most visits are stops in passing — a swim in one of the southern coves, a look into the caves from the tender, and back out before the afternoon wind fills in.