The bubbles at what is commonly called “Bubble Beach” on Kos, Greece, are a fascinating natural phenomenon with a geological explanation. The beach is officially known as Paradise Beach, and the “bubble” area is located a few meters off the shore.
The bubbling effect is caused by volcanic gases—primarily carbon dioxide—that are pushed up from the seabed. Kos is a volcanic island, and this area is part of a larger geothermal system connected to the nearby active volcanic island of Nisyros.
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This continuous stream of gas creates a unique and subtle “underwater champagne” or “natural Jacuzzi” effect. While the bubbles themselves are a highlight for swimmers and snorkelers, they do not produce any noticeable odor, unlike some other geothermal sites. The water in this specific area is not hot, but the geological activity does make the seabed slightly warm to the touch in certain spots.
The bubble beach on Kos: A family-friendly destination
The beach itself is one of the most popular and well-known on Kos. It is located on the southwestern coast in the Kefalos Bay area, about 35 kilometers from Kos Town.
Paradise Beach is characterized by its soft, golden sand and very shallow, crystal-clear turquoise waters. This makes it an ideal and safe destination for families with young children. The water remains shallow for a significant distance from the shore.
The beach is well-organized with a full range of amenities for tourists. These include sunbeds and umbrellas for rent, beach bars and restaurants serving food and drinks, and extensive water sports facilities. Visitors can rent jet skis, pedalos, or partake in other activities like parasailing and banana boating.
The specific location of the bubbles is often marked by a buoy or a large inflatable in the water, making it easy for visitors to find the spot to swim over and experience the phenomenon.
The bubbling at Paradise Beach is a direct result of the volcanic history and ongoing geothermal activity of the region.
Kos is part of the Hellenic Volcanic Arc, a chain of volcanic centers in the Aegean Sea. The western part of the island, including the Kefalos peninsula where Paradise Beach is located, is dominated by volcanic formations.
The geothermal activity at Kos is closely linked to the more recently active volcano on the nearby island of Nisyros. While Kos’s last major explosive eruption was approximately 160,000 years ago, it still has several thermal springs and gas vents, of which the bubbles at Paradise Beach are one of the most famous examples.
Related: Education With a Volcano as a Backdrop on Greece’s Nisyros
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