不ふ凍とう海かい

noun

ice-free sea

Refers to a sea or ocean area that does not freeze over, often used in geographical or climatological contexts.

• 北ほっ極きょく圏けんでも不ふ凍とう海かいが広ひろがっている場ば所しょがある。

  Even in the Arctic Circle, there are places where ice-free seas extend.