蒼そう波は

noun

blue wave; blue waves

Archaic literary term for blue or deep-blue waves, used in classical poetry and older texts.

• 古こ典てん和わ歌かでは「蒼そう波は」が海うみの情じょう景けいを表あらわすのに使つかわれる。

  In classical waka poetry, 'sōha' is used to depict a seascape.