The compass jellyfish (Chrysaora hysoscella) is a jellyfish that lives in surface waters in the Baltic, North Sea, English Channel, Atlantic and Mediterranean. It is easy to recognise: with a diameter of 10 to 30 cm, the compass jellyfish's umbrella has 16 dark brown V-shaped patterns, standing out on a light beige background and resembling a compass rose. It is found mainly between May and November and is often found in groups of several individuals.
It is a stinging jellyfish whose sting causes bathers a burning sensation, itching, relatively large skin lesions, and leaves streaks on the skin. The contact area may show small blisters and local oedema (swelling). The lesions disappear within a few hours.