Ancient Karthea — Kea’s Most Spectacular Archaeological Site

Karthea was one of the four ancient city-states of Kea and arguably the most important. Its ruins — temples to Apollo and Athena, an ancient theatre, fortification walls — occupy a dramatic coastal promontory on the southeastern tip of the island, reachable only on foot.

The Ancient City

Karthea was inhabited for approximately 1,400 years, from around the 8th century BC until its abandonment in the 6th century AD. At its height it was a significant Aegean port and cultural centre. The city produced poets, traded widely, and maintained temples to both Apollo and Athena whose foundations still stand today.

The Temple of Apollo (dated to around 530 BC) and the Temple of Athena are the most visible surviving structures, with substantial sections of their foundations and some architectural elements in place. An ancient theatre has been partially excavated and gives a clear impression of the city’s scale and cultural life. Sections of fortification wall and the remnants of streets and domestic buildings fill out the picture of a functioning Aegean polis.

The Setting

What makes Karthea exceptional is not only its archaeological importance but its complete isolation. The ruins occupy a headland above a small cove, with the Aegean stretching to the horizon on three sides. In spring, wildflowers grow among the ancient stones. The silence is total. There are no roads, no tourist infrastructure, no cafés — visiting requires genuine commitment, and the encounter with antiquity that results is correspondingly powerful.

Getting There — The Hike

There is no road to Karthea. The main route from Ioulida covers up to 12–13 km depending on the path chosen, passing through the hamlets of Mesaria, Profitis Ilias, Astra, Ellinika, and Agios Simeon before descending steeply to the coast. The trail is well-marked and rewarding, taking 4–6 hours depending on pace. It is physically demanding and not suitable in midsummer midday heat.

A shorter alternative — a 35–45 minute descent from the Havouna or Stavroudaki area — approaches Karthea from the northeast. A small beach below the site provides a swimming spot before the return climb. Guided tours with return transport are available through operators such as Kea Terra Active, which solves the logistical challenge of a point-to-point route.

Practical Tips

• Start the full hike from Ioulida no later than 7am in summer to avoid the worst heat
• Carry at least 2 litres of water per person and substantial sun protection
• The guided option via Kea Terra Active includes return transport — strongly recommended
• The beach below the ruins is clean and swimmable — bring a towel
• Spring (April–May) offers the best combination of cool air, wildflowers and clear views
• Good boots are essential; the descent to the site is rocky and steep