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#87

Celebrating Marine Day (海の日, Umi no Hi) : Japan’s Tribute to the Sea

by Rachel Anne

Every July, Japan sets aside a special day to honor the vast blue that surrounds its islands — Marine Day (海の日, Umi no Hi), also known as Ocean Day or Sea Day. Held on the third Monday of July, this national holiday is a time to appreciate the ocean’s bounty and reflect on its importance to Japan, a country whose history, culture, and livelihood are deeply tied to the sea.

Image Reference : https://www.snowmonkeyresorts.com/smr/takayama-city/winter-in-takayama-and-shirakawago

A Brief History

Marine Day was first celebrated in 1941 as “Marine Memorial Day” to commemorate Emperor Meiji’s 1876 voyage aboard the Meiji-Maru, an iron steamship. In 1996, it officially became a national holiday, making Japan the first country in the world to dedicate a public holiday to the ocean. Since 2003, it has been observed on the third Monday in July as part of Japan’s Happy Monday System, which aims to create long weekends for families to enjoy.

Image Reference : https://japan-forward.com/umi-no-hi-festival

How It’s Celebrated

While Marine Day doesn’t have grand traditions like fireworks or parades, many people take advantage of the long weekend to head to the beach, enjoy water sports, or join local ocean-themed events. Coastal towns often hold festivals, yacht races, and beach cleanups, and aquariums may host special programs to raise awareness about marine conservation.

Families and friends gather for seaside barbecues, beach volleyball, or simply relaxing by the shore — it’s a celebration of summer and a reminder of how vital the ocean is to Japan’s way of life.

3 Great Spots to Celebrate Marine Day

1. Enoshima Beach (Kanagawa)

Just a short trip from Tokyo, Enoshima is a favorite summer escape with its sandy beaches, surf spots, and iconic lighthouse views. Perfect for a day of swimming and seaside dining.

Image Reference : https://tokyocheapo.com/lifestyle/enoshima-island-sandy-beachy-getaway-from-tokyo

2. Okinawa’s Emerald Beach

For crystal-clear waters and a tropical vibe, Okinawa is unbeatable. Spend Marine Day snorkeling, diving, or enjoying local festivals celebrating the rich marine life of the islands.

Image Reference : https://churaumi.okinawa/sp/en/area/surrounding-area/emerald-beach

3. Oarai Aquarium (Ibaraki)

If you prefer an educational twist, visit one of Japan’s top aquariums. Oarai Aquarium hosts special Marine Day events where kids can learn about sea creatures and conservation efforts.

Image Reference : https://www.eye.co.jp/projects/examples/detail/id/sclu84/cid/10/sid/59

Whether you’re a local or a visitor, Marine Day is the perfect excuse to get out, soak up the sun, and appreciate the sea that nourishes and connects Japan to the world.

How will you celebrate Marine Day this year?

Posted : 21 July 2025