Vast lunar plain (3)
I believe the answer is:
sea
(Other definitions for sea that I've seen before include "Division of an ocean" , "The briny" , "Body of saltwater" , "E.g. Yellow, Red area" , "E.g Aral or Weddell" .)
I believe the answer is:
sea
(Other definitions for sea that I've seen before include "Division of an ocean" , "The briny" , "Body of saltwater" , "E.g. Yellow, Red area" , "E.g Aral or Weddell" .)