Linked from
The 6 pages that link to Oceanic zone, each with the reason it gives.
Pelagic zoneBroader topic: It is the offshore portion of the marine pelagic environment.
Pelagic fishBroader topic: Oceanic pelagic fish live far from shore and the seabed.
Hadal zoneNarrower topic: The hadal zone is the deepest part of the oceanic environment.
Neritic zoneCompared with: It lies seaward of the neritic zone and is generally deeper.