expression, noun
Marine Memorial Day
A specific Japanese commemorative day related to the sea; not a general term.
海の記念日は、海の恩恵に感謝する日です。
Marine Memorial Day is a day to give thanks for the blessings of the sea.
Compound of 海 (umi, 'sea') + の (no, possessive particle) + 記念日 (kinenbi, 'memorial day').