What does 深海 mean?
深海 is a Japanese noun meaning “deep sea, ocean depths” in English. It is written as 深海 in kanji, しんかい in hiragana, and shinkai in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
シーラカンスは深海に生息する。
The coelacanth inhabits the deep sea.