6 named features carry the IAU descriptor Fossa — a long, narrow depression on Europa, out of 117 in the mapped Solar System.
The IAU assigns each feature class on each world a naming theme. Across the 6 fossae with a recorded origin, 2 categories appear, led by Ireland.
Every one has its own page, on the surface it sits on.
The same descriptor is used on 8 other worlds, for 111 more features.