If you’re traveling to the Great Barrier Reef, you likely plan to get in some water-focused activities. No matter your level of expertise or skill, there are some dangers to be aware of.

The reef covers a huge area ( bigger than all of Italy ). So we can assume its biodiversity is on a grand scale too. As such there are lots of critters in there that can cause pain and suffering.

Box jellyfish
Cone shells
Hydroids
Irukandjis
Red bristle worms
Scorpionfish
Sea snakes
Sea urchins
Sharks
Sting rays
Stinging corals
Stonefish

Any activity focused at or in the water carries with it a certain level of inherent risk. Be sure you have all the applicable safety accoutrements with you and take care to dive or snorkel with a partner, for safety sake. Pay attention to the tides and remember not to relax just because you are a strong swimmer or experienced diver – you well know the ocean has a mind of its own.

*Box jelly fish are considered one of the most dangerous creatures in and around the reef waters. This jellyfish is transparent and pale blue and can be found in abundance particularly after rains and their season, therefore, is the rainy season, beginning somewhere around November. You’re less likely to find them the seas are rough. 

*There are at least 15 different species of sea snakes recorded around the Great Barrier Reef area. These snakes are venomous, but there have been no known deaths from them and they are not normally aggressive, but experts suggest staying away anyhow.