Marine Day

Marine Day, or Umi no Kinenbi (海の日), is a Japanese national holiday celebrating the country’s close relationship with the sea and expressing gratitude for the ocean’s importance to Japan’s history, economy, food culture, transportation, and natural environment. Japan is an island nation whose communities have long depended on fishing, maritime trade, shipbuilding, and coastal resources. In 2026, Marine Day will be observed on Monday, July 20, in accordance with the rule that it falls on the third Monday of July.

The holiday originated as Marine Memorial Day, established in 1941 to commemorate Emperor Meiji’s return by sea to Yokohama in 1876 after a voyage around the Tohoku region aboard the imperial vessel Meiji Maru. It became a national holiday under its present name in 1996, making it Japan’s first national holiday dedicated to the ocean. Since 2003, Marine Day has followed the Happy Monday system, which moved it from July 20 to the third Monday of July in order to create longer weekends. The holiday also encourages public reflection on marine conservation, pollution, coastal ecosystems, and the responsible use of ocean resources.

Marine Day is commonly marked by trips to beaches, seaside resorts, aquariums, ports, and waterfront parks, taking advantage of the midsummer three-day weekend. Families may swim, enjoy boating or fishing, watch fireworks, and participate in coastal festivals, while museums, aquariums, and maritime organizations often hold educational programs about ships, marine life, ocean safety, and environmental protection. Schools, municipalities, and volunteer groups may organize beach cleanups and other activities promoting care for Japan’s seas.

Seasonal foods associated with the day often include seafood such as sushi, sashimi, grilled fish, and regional coastal specialties, although there is no single nationwide Marine Day dish. Many people also enjoy summer foods and refreshments such as shaved ice, noodles, watermelon, and cold drinks during outings. The holiday has no mandatory religious ritual or fixed greeting; a suitable seasonal expression is “海の日おめでとうございます” (Umi no Hi omedetō gozaimasu, “Happy Marine Day”), while messages frequently emphasize appreciation for the ocean and wishes for safe, enjoyable summer activities.