Crossword Genius

Geographical heptad (4)

Ross

I believe the answer is:

seas

'geographical heptad' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for seas that I've seen before include "Red and Dead" , "Bodies of salt water" , "Red and Black are" , "Aegean and Mediterranean, say" , "Oceans" .)

I've seen this clue in The New York Times.
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