Palea Kameni Hot Springs

Overview

Palea Kameni is a small volcanic islet west of Nea Kameni where underwater volcanic vents heat the surrounding seawater, creating natural hot springs. Visitors swim from their boats to the sulfurous warm waters in a vivid yellow-green bay that contrasts dramatically with the deep blue Aegean.

Highlights

• Thermal waters: The sea temperature around the springs can reach 30–35°C, significantly warmer than the surrounding Aegean.
• Sulfur deposits: The mineralized water leaves a characteristic orange-yellow stain on skin and swimwear.
• Volcanic swimming: A unique experience of swimming in volcanically heated waters inside an active caldera.

History

Palea Kameni ("Old Burnt Island") first emerged from the sea in 197 BCE during a submarine eruption and is the oldest of the intracaldera volcanic islands. The hot springs on its northeastern shore have been known since antiquity and were used for therapeutic bathing. The geothermal activity is a surface expression of the magma chamber that lies beneath the caldera.

Visitor Tips

• Tip 1: Wear a dark swimsuit — the sulfur-rich water permanently stains light-colored fabrics.
• Tip 2: Most caldera boat tours include a stop here, but independent boat rentals can also access the bay.
• Duration: 30–45 minutes in the water.