Sea Day, also known as Marine Day or Ocean Day, is the only Japanese national holiday in July and falls on the 21st this year. Originally meant to commemorate the return of a Meiji emperor to the Yokohama Port, it now marks the end of the rainy season—well, roughly. For those of us who live further from the bay, or who don’t fancy getting sand in our shoes on the beach, there are still ways to celebrate Sea Day without actually going to the coast. Japan boasts a number of aquariums where visitors can experience the beauty and diversity of marine life. Here are some of our top picks for the best aquariums in Japan.

Best Aquariums in Japan

Okinawa Churaumi Aquarium

The Shark Research Lab at Okinawa Churaumi Aquarium presents the world’s first exhibit of a captive-bred tiger shark. Their shark tank also houses other rare breeds, such as the silvertip shark and the silky shark, which can be seen nowhere else in mainland Japan. The largest tank, Kuroshio Ocean, offers a mesmerizing view of over 16,000 fish and 70 species. With the aquarium’s array of regional shark, coral and manta ray species, visitors can witness the wonders of Okinawa’s waters, from reefs to the deep sea.

March – September 8:30am – 6:30pm
Adults ¥2,180, students between ¥710 – ¥1,440, free for children under six (discounts for groups of more than 20)
424 Ishikawa, Motobu-chō, Kunigami City, Okinawa
churaumi.okinawa/en

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Sunshine Aquarium

In the heart of bustling Tokyo is an unexpected marine oasis that’s also Japan’s first urban highrise fishbowl — Sunshine Aquarium. Permanent exhibitions include those that highlight various aquatic ecosystems and waterside habitats, as well as the rooftop Outdoor Marine Garden, which features penguins “flying” across the city sky. Visitors can watch the penguins, otters, pelicans and dorados feed, as well as performances from divers and sea lions. Animal handlers conduct guided expeditions for an even more personal experience with the creatures.

Get your tickets here!

Hours: 10am – 7pm (from July 19 open until 8pm)
Tickets: Prices varies depending on the day. Adults ¥2,600-¥3,200 (high school students or older), children ¥1,300 (elementary/juniorhigh school students), pre-schoolers ¥800 (free for children under 4)
Location: Rooftop of World Import Mart Building, Sunshine City
3-1 Higashi-Ikebukuro, Toshima-ku
Station: Ikebukuro
sunshinecity.jp/en

Art Aquarium

During the Edo period, the kingyo (goldfish) became a prominent part of Japanese culture. The Art Aquarium’s goldfish exhibit Watching Goldfish transforms this traditional Japanese aesthetics into a dazzling, multisensory experience. Over 5,000 goldfish swim in illuminated tanks shaped like lanterns, folding screens and origami. Accompanied by light, music and seasonal scents, the exhibit blends Edo-era elegance with modern design, turning these ornamental fish into living works of art in a dreamlike, immersive space.

Get your tickets here!

Hours: 10am – 7 pm
Tickets: Adults ¥2,500 (junior high school students and above), free admission for up to two children (elementary school age or younger) per adult
Location: Mitsukoshi Ginza Terrace
4-6-16 Ginza, Chuo-ku
Station: Mitsukoshimae
artaquarium.jp

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Port of Nagoya Aquarium

The first step to protecting the ocean is to learn about it. In order to introduce visitors to marine marvels, the Port of Nagoya Public Aquarium displays creatures from all over the world, including the seas around Japan, tropical oceans, Australian freshwater bodies and even the Antarctic ecosystem. The North Building pays homage to cetaceans like orca whales and dolphins, animals that have adapted exceptionally well to underwater life over billions of years. The aquarium conducts talks with divers and penguin-keepers, training sessions for belugas and orcas and performances from dolphins.

July 1 – July 21 9:30am – 5:30pm, July 22 – August 31 9:30am – 8pm, September 9:30am – 5:30pm
Adults (including high school students) ¥2,030, junior high and elementary school students ¥1,010, children ¥500, free for children under 4
1-3 Minato-machi, Minato-ku, Nagoya
Station: Nagoya
nagoyaaqua.jp/en

Toba Aquarium

Toba Aquarium is famous for being the only place in east Asia where you can see a dugong in captivity. Aside from meeting this endearingly-chubby marine mammal named Serena, visitors can sit and take selfies with walruses, watch seals and finless porpoises and see otters at feeding time. There’s also a stunning large coral reef aquarium tank with a glass roof. Here, visitors can admire turtles and tropical fish drifting and darting above their head and between the live coral. On the creepier side of things, delve into the deep sea in the Unusual Creatures Laboratory to see alien-like giant isopods and the bizarre, glass-like spiny lobsters.

9am – 5pm (8:30am – 5:30pm from July 20 – August 31)
Adults ¥2,800, children between ¥800 – ¥1,600 (free for children under 3)
Toba 3-3-6, Toba-ku, Mie
Station: Toba
tobaaquarium.co.jp/en

Sumida Aquarium

On the fifth and sixth floors of Tokyo Solamachi are over 10,000 sea creatures. The Sumida Aquarium uses an artificial seawater production system, maintaining water quality and decreasing carbon emissions that are caused by transporting seawater inland. Visitors can wander around freely, chat with aquarium staff and even witness interactions between the animal-keepers and aquatic life. Sumida features an open indoor tank with penguins and fur seals, a magnificent jellyfish display and a research laboratory. They also recently introduced baby penguins to the pool.

10am – 8 pm (Monday-Friday) 9am – 9pm (Saturday, Sunday and holidays)
Adults ¥2,500, high school students ¥1,800, junior high and elementary school students ¥1,200, children ¥800 (free for children under 3)
5-6F, Tokyo Skytree Town Solamachi
1-2, Oshiage 1-chome, Sumida-ku
Station: Oshiage (Skytree-mae)
sumida-aquarium.com/en

Maxell Aqua Park Shinagawa

Equal parts educational display and show space, Maxell Aqua Park Shinagawa combines light and video shows with tanks of marine animals. Jellyfish Ramble is one of the park’s 11 zones, with a relaxing jellyfish display and immersive music. For the summer, Maxell Aqua Park is staging a spectacular fusion of light, sound and marine life—featuring digital pyrotechnics over underwater goldfish and lantern-lit ceilings—bringing the essence of a summer festival into an aquatic realm. Be sure to check out the day and night dolphin performances.

Opening hours varies, but always open 10am – 8pm
Adults ¥2,500 (including high school students), junior high and elementary school students ¥1,300, children ¥800 (free for children under 4)
4-10-30 Takanawa, Minato-ku
Station: Toyosu or Shijo-Mae
maxell-aqua-park.jp/en

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Are you looking for outdoor activities to celebrate Sea Day? Read our guide to Mikuni Minato: A Peaceful Port Town Away from the Crowds, or Tokyo Day Trip: Enoshima Caves, Shrines and Sea Views.