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Marine Day in Japan

Immerse yourself in the beauty of Marine Day in Japan! A day dedicated to honor the ocean's bounty and revere Japan's maritime heritage.

Monday

July 2026

Last updated February 7, 2026 · by the Holiday Calendar Team

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YEARLY DATEThird Monday in July

OBSERVED INJapan

CATEGORYNature

SUBCATEGORYOcean

INTRO

Introduction

PHOTO

Dive into the fun and excitement of Marine Day in Japan on July 15! Known as "Umi no Hi" in Japanese, this special day is a grand celebration of the sea's richness and the vital role it plays in the life and culture of the country. Japan, being an archipelago, has a unique and deep connection with the ocean, and Marine Day serves as a perfect occasion to recognize and appreciate that. It's interesting to note that Marine Day only became a public holiday in 1995, initially observed to mark the return of Emperor Meiji from a sea voyage to Hokkaido in 1876. The holiday was moved to July in 2003 to accommodate the Happy Monday System - a move that aimed to create more three day weekends for Japanese workers. This fascinating day filled with maritime merriment and oceanic observance provides an extraordinary glimpse into Japan's endearing respect and appreciation for the sea's bounty. So, ready to set sail for an adventure this Marine Day? Seas the day!

TIMELINE

Marine Day in Japan Timeline

Emperor Meiji's Sea Voyage

Emperor Meiji's return from a sea voyage to Hokkaido, which is later marked as Marine Day.

Informal Observance Begins

Japan begins to informally observe July 20th as Marine Memorial Day.

Marine Day as a Public Holiday

The Japanese government declares Marine Day as a public holiday.

Date Shifted for Happy Monday System

To create more three-day weekends, Marine Day is moved from July 20 to the third Monday in July.

Annual Marine Day Observance

Japan continues to celebrate Marine Day every year, honoring the sea's bounty and its maritime heritage.

GET INVOLVED

How to Celebrate Marine Day in Japan

Partake in a beach clean-up

What better way to show your gratitude to the ocean than by helping to clean it up? Join a local beach clean-up effort or organize your own. It's not just an eco-friendly activity; it's also a great way to socialize and get some exercise.

ENJOY

Enjoy a seafood feast

Japan is known for its seafood. Celebrate Marine Day by preparing a special meal featuring the bounty of the sea. Try making sushi at home or grill some fresh fish for a nice change.

VISIT

Visit an aquarium

Show your appreciation for the marine life by visiting one of Japan's many excellent aquariums. Immerse yourself in this underwater world and learn about the amazing creatures that inhabit our oceans.

ENGAGE

Engage in water sports

Depending on where you are in Japan, you might have the chance to enjoy water sports such as snorkeling, diving, swimming, or even surfing. Make the most of Marine Day by being active and enjoying the water in a fun way.

CREATE

Create ocean-themed arts and crafts

Show off your creative side by engaging in some DIY arts and crafts. Create something sea-related, like a beautiful seashell necklace or an ocean painting, and you'll have a wonderful memento of Marine Day.

WHY THIS DAY MATTERS

Why Marine Day in Japan is Important

A Day of Fun Activities

Whether it's enjoying a seafood feast, visiting an aquarium or engaging in water sports, Marine Day offers a wide array of fun, water-related activities that both adults and children can participate in and enjoy. The holiday is not just about observance, but also making memories and having a great time.

Celebrates the Importance of Maritime Culture

Marine Day recognizes and appreciates the important role that the ocean plays in Japan's life, culture, and history. Being an island nation, the sea is highly significant to Japan. The holiday allows us to reflect on this significance and celebrate Japan's maritime heritage and culture.

Promotes Environmental Awareness

Marine Day reminds us of our responsibility to protect and conserve the ocean and its diverse ecosystems. By participating in events such as beach clean-ups, we can contribute to the global effort of preserving aquatic life and promoting clean, healthy oceans.

Related holidays

National Marine week

Dive into the excitement of National Marine Week and discover the wonders of our oceans with fun events, educational activities, and conservation efforts!

Mother Ocean Day

On Mother Ocean Day, let's give thanks to the vast and beautiful waters that sustain life on our planet. Let's also pledge to protect it for future generations!