海の日[ Umi no hi ]Marine Day

Marine Day (海の日, Umi no Hi), also known as "Ocean Day" or "Sea Day", is a Japanese national holiday celebrated on the third Monday in July. The purpose of the holiday is to give thanks to the ocean's bounty and to consider the importance of the ocean to Japan as an island nation. Many people take advantage of the holiday and summer weather to take a beach trip. Other ocean-related festivities are observed as well.

from Marine_Day (Wikipedia) CC BY SA 3.0