It's not extremely rare to see bioluminescence but it can also be predictable to witness and it's most common in marine environments, most particularly in the deep ocean in which a large percentage of animals are bioluminescent.
And on land the bioluminescence is even rarer, and is primarily found in fireflies or even some glowworms and fungi.
A significant portion of deep-sea creatures are bioluminescent, making it a common occurrence in those environments, though often unseen by human.
Bioluminescence can be seen in coastal areas, especially during events like red tides, which involve large blooms of bioluminescent dinoflagellates.
The visibility of bioluminescence also depends on factors like the density of bioluminescent organisms, moon phase (darker nights are better), water conditions (calm and windless waters are ideal), and the time of year.
And even in areas where bioluminescence is known to occur, it's not guaranteed to be visible every night, as it can be affected by various environmental factors.
It's not OK to touch bioluminescence light when it is caused by algae blooms.
Some bioluminescence algae is harmless but others can be toxic and cause illness and or skin irritation.
Also disturbing of the organisms which cause the bioluminescence can also harm them and disrupt the natural ecosystem.
Not all forms of bioluminescent algae are harmful, although some species of bioluminescent algae can produce toxins which are dangerous to animals and humans.
And even if the bioluminescence is not cause by a toxic species, coming into direct contact with the bioluminescence algae can still cause skin irritation and even other adverse reactions.
Touching or disturbing of the organisms which create the bioluminescence can also disrupt the natural behavior of the organisms and even harm them.
Bioluminescence is a beautiful natural phenomenon, although it's best to observe it from a distance and avoid touching it or disturbing the organisms.
And in some bioluminescent bays, swimming is also restricted or even prohibited to protect the delicate ecosystem and the organisms which produce the light.