KASTRAKI: NAXOS'S UNTAMED SOUTHERN COAST

Kastraki lies on the southern part of Naxos's western coast, roughly sixteen to seventeen kilometres from Naxos Town, forming the direct continuation of Mikri Vigla's beaches before the coastline gives way, further south still, to the protected Alyko peninsula. It is among the longest beaches on the island, stretching for more than three kilometres of fine, pale sand and cool, crystal-clear water, and among the quietest, having remained largely free of the sunbed rows and beach bars that line much of Naxos's more central coastline. Its name, unusually for a beach, refers not to the sand or the sea but to a specific building: a small Venetian tower standing a short distance inland, from which Kastraki, "little castle," takes its name.

The Tower Behind the Name

That tower, known as Pyrgos Oskelou, or the Oskelos Tower, dates to the 17th century and stands roughly two kilometres east of the beach settlement. It is historically linked to the Sommaripa family, one of the noble Venetian households whose coats of arms can still be found carved into doorways within the Kastro of Naxos Town, and whose influence extended across several of the Cyclades during the long Venetian period. What makes Oskelos Tower unusual among Naxos's many surviving Venetian towers is its location: where most, including Bazeos Tower and the fortified monasteries covered elsewhere in this series, were built deep in the island's agricultural interior, Oskelos stands close to the sea, giving it a noticeably more defensive character, with considerable height built specifically to watch the coastline rather than simply to house and protect a rural estate. The tower is open to visitors today and offers sweeping views across the water toward the islands of Paros and Ios — a worthwhile short detour for anyone exploring the area beyond the beach itself.

Traces of a Mycenaean Acropolis

Kastraki's history reaches back considerably further than its Venetian-era tower. Close to the modern village, traces of a Mycenaean acropolis remain visible, evidence of settlement here stretching back more than three thousand years to the same Late Bronze Age period that shaped the city at Grotta and the elite cemeteries at Aplomata and Kamini, elsewhere on the island. This is not an excavated, formally presented archaeological park in the manner of Naxos's larger sites, but the presence of these ancient remains, quietly visible near an otherwise unassuming beach settlement, adds a genuine sense of depth to a place many visitors pass through purely for the sand and sea.

Three Kilometres of Undeveloped Coast

The beach itself is composed of fine, soft sand, described by regular visitors as nearly white or a pale, shimmering gold, extending for more than three kilometres along the coastline with little interruption. Some sections of sand are finer and softer than others, while stretches further along can be slightly coarser, giving the beach an authentic, unmanicured character distinct from the more uniformly maintained sand at busier resorts closer to town. The water is consistently described as crystal clear and refreshingly cool, though visitors should take some care when swimming, since sections of the seabed near the shore feature uneven rock formations rather than a uniformly sandy bottom.

Even during the busiest weeks of July and August, Kastraki's sheer length means it is almost always possible to walk a short distance from the main access points and find a genuinely quiet stretch of sand. The beach is not organised in the manner of Agios Prokopios or Agios Georgios: no sunbeds or umbrellas are provided, and visitors intending to spend a full day here should bring their own shade and equipment. A handful of tavernas, small markets and accommodation options operate in the surrounding area, though generally set back from the sand itself rather than lining the beachfront directly.

A Quiet, Secluded Character

Kastraki has built its reputation specifically on the tranquility that its scale and lack of development allow. The northern end, closer to Mikri Vigla, tends to feel busier and somewhat more accessible, while the beach grows progressively wilder and more remote further south. Its seclusion has also made parts of the beach a natural, informal draw for nudists, who make use of its quieter stretches away from the more visited access points. Outside the peak summer weeks, Kastraki is, by most accounts, one of the most peaceful beaches on Naxos, drawing visitors specifically seeking distance from the island's busier resort areas.

Neighbouring the Alyko Cedar Forest

Immediately south of Kastraki lies the Alyko peninsula, a protected nature reserve and one of the more distinctive natural landscapes on Naxos. The peninsula is home to a rare forest of cedar trees — technically a species of juniper — growing directly out of white sand dunes, some of the gnarled, weathered specimens estimated to be more than two hundred years old. The area falls under the European Union's Natura 2000 network of protected sites, recognised as an important habitat for local wildlife, and a network of sandy paths through the dunes offers both natural shade and access to several smaller, more secluded coves tucked along this stretch of coastline. Together, Kastraki and Alyko form one of the more ecologically significant and visually striking corners of the island's southwestern shore.

Getting There

Kastraki is reached from Naxos Town via the coastal route running south through Agios Prokopios, Agia Anna and Plaka, or via the inland road through the village of Vivlos, continuing afterward along an asphalt road and a final kilometre of well-maintained dirt track. The journey covers roughly sixteen to seventeen kilometres and is most comfortably made by car, given the beach's distance from town and its lack of a dedicated public transport stop directly on the sand.

Nearby: The End of the Southwestern Coastline

Kastraki marks close to the final stretch of Naxos's long southwestern beach corridor, with Mikri Vigla immediately to the north offering considerably more infrastructure, including some of the island's best-known windsurfing and kitesurfing conditions, and the Alyko peninsula and its cedar forest continuing the coastline south. The further beach of Glyfada lies a short distance beyond Kastraki again, rounding out a stretch of coast that, taken as a whole, offers Naxos's most complete transition from developed resort beach to genuine, undeveloped wilderness within a single continuous shoreline.

Kastraki asks little of a visitor beyond a willingness to carry their own shade and walk a little further than the nearest car park, and it repays that effort with something increasingly rare on Naxos's more central coastline: three uninterrupted kilometres of quiet, a Venetian tower with a real story attached to its name, and Mycenaean stones no one has bothered to fence off. For a genuine sense of the island's less curated side, few beaches on Naxos make the case as convincingly.