Looking for a tour of Puerto Escondido’s bioluminescent lagoon? You should be! A Phosphorescence Tour of Manialtepec Lagoon is one of the top things to do on a visit to Puerto Escondido as it’s once of few places in the world where you can actually swim with incredible glow-in-the-dark bioluminescent plankton. Here’s what you need to know about experiencing the unique Manialtepec Lagoon bioluminescence natural phenomenon.

Depart from this dock at sunset

Manialtepec Lagoon Bioluminescence

What is it like to swim with glowing plankton? I was floating in a boat in the middle of a lagoon under an ink-black night sky when I heard a large splash. Someone in our group had jumped into the water.

Man overboard! Swimming at Manialtepec Lagoon near Puerto Escondido

We were participating in a Fosforescencia or Phosphorescence Excursion with Lalo Ecotours, a experience offered at special times of the year, when a unique alchemy of ocean currents and water temperature draw dinoflagellate plankton into Laguna Manialtepec or Manialtepec Lagoon, a deep lagoon located 20 minutes outside Puerto Escondido. Much like fireflies of the north, the half-plant half-animal organisms glow with a  white light creating an eerie shimmer to the water.

Bioluminescent jellyfish Credit: NOAA

Local History of  the Manialtepec Lagoon Bioluminescence

“Ancients believed bathing in phosphorescence gave them special energy and made them more youthful,” explained Ebarardo, our guide. His family has lived at Las Negras on the lagoon for generations, one of 150 families who  earn a living by fishing and now, by offering bioluminesence tours of the mangrove swamp. If you’re taking a tour of the mangrove, book directly with them or Gina Machorro at the Tourist Office and you’ll help support local families.

Fishermen on Manialtepec Lagoon by day

“That’s it. You talked me into it. I’m going in,” said Zelda, a woman seated in front of me in the boat. She jumped over the edge and was soon floating, making snow angels in the water, her arms glowing wings of shimmering white. Surrounded by tendrils of black mangroves with the lagoon itself wafting a rather funky smell, this lagoon didn’t bear any resemblance to The Blue Lagoon of Brooke Shield’s 1980’s movie fame.

We could see schools of tiny fish, glowing like radioactive Nemo’s beneath the surface of the water. They scattered in all directions as the swimmers surfaced, their heads bathed in a sparkling sheath of white droplets.

Is it just me or are mangroves creepy?

Bioluminescent Plankton Locations around the World

“ There are lots of bioluminescent beaches but only two bioluminescent lagoons in the world,” said Ebarardo. “One here in Oaxaca and another in Puerto Rico. The best viewing times are at the New Moon when the sky is at its darkest.”

I dipped my hand in the water and droplets of sparkly stars poured from my hands.

“It’s like swimming with stars, ” said the woman in the water as she gazed up at the night sky which wrapped around us.

Legends say the Milky Way was road between life and death Credit: ESO/ Schoedel

Above me was a dome of constellations, planets and the Milky Way, which to the ancients represented the birth canal of the Cosmic Mother and the starting point of all life. The path led to the Underworld and represented man’s journey on earth.

The night sky was a sight  I’d forgotten from my childhood growing up in Canada’s north, far from city lights. I scooped up a handful of water and realized I didn’t have to drink from the Fountain of Youth, I could hold it in my hands.

What to Pack: Wear a long-sleeved shirt and long sleeved pants to avoid insect bites. Be sure to bring a bathing suit and towel if you plan to swim. Insect repellent is also a must.

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For more ideas on what to do in Puerto Escondido, check out these posts for ideas on adventure, excursions, restaurants and day trips:

Experience untouched Mexico on a day trip to  Roca Blanca Beach 

7 Awesome Natural Wonders in Puerto Escondido, Mexico

Weird but amazing foods to try in Puerto Escondido, Mexico

Beginners Guide to Puerto Escondido Beaches 

How to Get from Huatulco to Puerto Escondido 

Updated: April 2018