You may have seen the pictures.
It’s night-time in an impossibly exotic location. Waves are breaking on the beach. The water is sparkling with electric blue lights.
The internet loves an image of a magical-looking bioluminescent bay. You may also have seen travel bloggers bemoaning the real event as not quite living up the hype.
Even if the latter is true, bioluminescence (in this case usually caused by planktonic organisms called dinoflagellates) is a pretty amazing natural phenomenon.