noun
oceanic water; pelagic water
Technical term in oceanography and marine science, referring to water in the open ocean away from coastal influences. Contrasts with 沿岸水 (coastal water).
See also: 沿岸水
外洋水は沿岸水より塩分濃度が高いことが多い。
Oceanic water often has a higher salinity than coastal water.
沿岸水 refers to coastal water near the shore, while 外洋水 refers to open-ocean water.
Compound of 外洋 (open ocean) + 水 (water).