noun, noun which may take the genitive case particle 'no'
on the sea; offshore; maritime
Refers to something happening, located, or operating on the open sea or ocean, often in contrast to land or coastal areas. Common in news and technical contexts.
洋上風力発電は再生可能エネルギーの一つだ。
Offshore wind power is one form of renewable energy.
The ship encountered a storm on the open sea.