What does 海面 mean?
海面 is a Japanese noun meaning “sea level, (surface of) sea” in English. It is written as 海面 in kanji, かいめん in hiragana, and kaimen in romaji. This word is part of JLPT N2 vocabulary.
Example sentence
大きな岩が一つ海面から突き出ていた。
A big rock rose out of the sea.