At the hospital I work at, we have EN's in all areas of the hospital except for PICU and NICU.
I just do casual pool at the moment and work all over the hospital... I work a lot in Emergency and we have quite a few EN's there, as well as in all the other wards like cardiac, burns, orthopaedics, transplant, surgical ward, general medical, mental health, etc... A friend of mine who is now an RN, was working as a scrub/scout nurse in theatres when she was an EN. And I've also seen EN's working in special care nursery at some hospitals.