A special night tour to experience the bioluminescent plankton and sea fireflies of the Seto Inland Sea.

Sea fireflies

Would you like to experience the fantastical world of bioluminescence that appears at night in the Seto Inland Sea ? Here's an introduction to a small-group night tour held in Tamano City , Okayama Prefecture .

2026.05.29

During the day, the Seto Inland Sea presents a calm and serene appearance. However, at night, a fantastical blue light spreads across the sea.

This small-group night tour in Tamano City , Okayama Prefecture , allows you to observe two types of bioluminescence: sea fireflies and bioluminescent plankton. You can collect sea fireflies using environmentally conscious methods and experience their mystical blue glow up close on the palm of your hand, as well as enjoy the fantastical sight of bioluminescent plankton spreading along the shoreline. Furthermore, there will be a mini-seminar on the mechanism of bioluminescence and the nature of the Seto Inland Sea, as well as photography advice on how to beautifully capture the bioluminescent phenomena. We introduce a special night experience unique to the Seto Inland Sea, where nature, science, and photography come together.

For more details, please see the article below.

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