Where does “北極海” come from?

北極海 (Japanese) comes from Japanese 海, from Old Japanese うな.

北極海 (Japanese): the Arctic Ocean

Definitions

  1. the Arctic Ocean

Ancestry of “北極海”, step by step

北極海 traces back through two separate lines of ancestry.

via Japanese

StepLanguageWordMeaning
1Japanesea sea, an ocean; a lake; an object covering over...
2Old Japaneseうな

via Japanese 北極

StepLanguageWordMeaning
1Japanese北極Short for 北極圏. north polar region, north pole;...
Every word from Old Japanese うなEvery word from Japanese