Lorraine Williamson
Forget far-flung tropical islands—one of nature’s most dazzling nighttime spectacles is found not in the Maldives or the Caribbean, but off the rugged northwestern coast of Spain. In the quiet coastal town of Cee, Galicia, a rare and mesmerising phenomenon lights up the Atlantic each summer: the mar de ardora, or sea of fire.
As darkness falls on the beaches near Cee—Estorde and Gures, among the most prized spots—the waves sometimes shimmer with an eerie blue light, as though the sea is breathing electricity. There’s no artificial trickery here. This is bioluminescence in its raw, natural form, caused by microscopic marine organisms called Noctiluca scintillans, aptly named for their twinkling presence.
What causes the glow?
These single-celled plankton emit light when disturbed—a natural defence mechanism that, to human eyes, feels like something out of a dream. The effect can be triggered by the movement of waves, a splash of a paddle, or even your steps through the shallows. As your body meets the water, it comes alive with radiant blue bursts. It’s not just beautiful—it’s almost otherworldly.
When and where to witness it
Your best chance of catching this natural light show is during the height of summer, particularly throughout August, when Galicia’s waters are warmest. Moonless nights offer the darkest conditions, ideal for seeing the bioluminescence in full effect. Locals often suggest heading to Playa de Estorde or Playa de Gures, both near Cee, and waiting patiently until your eyes adjust to the dark. There are no tickets or tour guides: just nature—and a little luck.
Tips for the best experience
Local fishermen and residents are often your best source of advice, as they know the rhythms of the tides and the secrets of the coast. Bring no torch, no bright screens—just a sense of wonder and a respect for the environment.
The sparkle is most visible when the sea is calm, the air is warm, and there’s no artificial light nearby. Consider wading gently through the water, or better yet, take to a kayak and let each stroke ignite the glow. But tread lightly. The phenomenon is delicate, and locals urge visitors to leave no trace and not to interfere with marine life.
A global phenomenon with local magic
Though Galicia’s glowing sea may feel like a recent discovery, it has fascinated scientists for over a century. Since 1915, researchers have recorded similar occurrences in more than 200 locations worldwide, from Puerto Rico’s famed Phosphorescent Bay to stretches off the Somali coast and the Indian Ocean. Yet each location has its own character, its own mood—and Galicia’s mar de ardora is especially precious for its quiet, unspoilt authenticity.
Respect the mystery
The glowing sea of Galicia isn’t a show—it’s a phenomenon. There are no schedules, no guarantees. But for those willing to slow down and listen to the rhythm of the coast, it’s one of the most spellbinding sights Europe has to offer.
And in a world of artificial lights and curated experiences, perhaps the most magical thing of all is that this wonder asks nothing of you—only your patience, your presence, and your respect.
The Cies Islands – Galicia´s hidden paradise
Source: Europapress