part of
ocean
sea
saline water
sea water
EcoLexicon:sea_water
When we have more classes representing the various processes which make seawater seawater, we can further axiomatise this class.
https://en.wikipedia.org/wiki/Sea_water
This definition refers to water that is actually in a sea or ocean. This water may have a wide range of salinity levels.
ocean water
seawater
SWEETRealm:SeaWater
LTER:701
Water which has physicochemical properties that have been determined by the processes occuring in a sea or ocean.