If you're visiting Tokyo, Japan, you've almost certainly noticed the Tokyo Skytree soaring above the skyline — but you might never have guessed that tucked inside floors 5 and 6 of the tower is Japan's second-largest aquarium: the Sumida Aquarium. It offers a unique detour beyond the usual shopping and sightseeing itineraries in central Tokyo. The entire aquarium runs on artificial seawater, which not only cuts the carbon emissions from trucking ocean water inland, but also maintains a consistently stable water quality — ideal for the delicate, showcase-worthy marine life on display. When you visit Sumida Aquarium, don't miss the garden eel exhibit and the penguin zone. Beyond the animals themselves, the aquarium creates an atmosphere unlike anything you'd find at aquariums in Taiwan, weaving interactive art and lighting installations throughout — a true testament to the care and creativity that goes into Japanese curation!
Before diving into the details of Sumida Aquarium, it's worth acknowledging that many divers and environmentalists believe these animals belong in the wild, not confined to small display tanks. That said, if a space like this — or an aquarium in general — can use entertainment to help city dwellers connect with marine life and the ocean, perhaps it qualifies as a tolerable necessary evil. Take Vancouver Aquarium in Canada, for example: it continuously educates visitors about ocean plastics and marine wildlife rescue through its exhibitions — an approach that is arguably far more effective than rigid, didactic campaigning.
How to Buy Tickets for Sumida Aquarium
Sumida Aquarium sits beneath Tokyo Skytree and is easily reached by taking the subway to Oshiage Station and walking from there. The shopping complex at the base of the tower is quite large, radiating out from the tower in two wings on either side, so it's worth studying the Skytree floor map beforehand to avoid getting lost. Because Sumida Aquarium is located at this major tourist hub, it keeps longer hours than a typical aquarium — open daily from 0900 to 2100 — making it easy to fit into a flexible itinerary.
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General admission: 2,500 JPY
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High school students: 1,500 JPY
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Junior high and elementary school students: 1,000 JPY
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Children (aged 3 and above): 600 JPY
Before purchasing your tickets, it's worth checking whether KKDAY or KLOOK offer a Skytree + Aquarium combo ticket — you might be surprised by the savings. Japan is also actively promoting mobile payments right now, so many popular attractions offer a discount when you buy e-tickets in advance!
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Sumida Aquarium, nestled beneath Tokyo Skytree
The Sumida Aquarium ticket counter is tucked away in a discreet corner of the shopping complex
Entrance to Sumida Aquarium at the Base of Tokyo Skytree
The entrance to Sumida Aquarium
The first exhibit area just inside the entrance is relatively compact
Being located in the heart of space-constrained central Tokyo, the aquarium is smaller than other Tokyo aquariums in terms of its exhibit area, and neither the number nor the variety of fish species is the greatest — but its unbeatable accessibility is a major selling point.
Upon entering, you're greeted by a series of tanks depicting natural aquatic landscapes (the Editor breezed past this section). The next area is a jellyfish zone styled like a hypnotic nightclub: coloured lighting transforms the translucent jellyfish into creatures wearing entirely different faces. Sumida Aquarium has also dedicated a section to an open working area, where visitors can peek behind the scenes and witness the fascinating — and demanding — daily care of marine life up close. When the Editor visited, a staff member happened to be "bathing" jellyfish with a small pipette. Unable to understand Japanese, the Editor could only watch as children and the aquarium staff excitedly discussed what was happening — but this kind of interactive zone undeniably creates a meaningful connection between children and marine life, and may be even more valuable than the touch pools commonly found at aquariums in Taiwan.
Sumida Aquarium showcases a wide variety of jellyfish species
Coloured lighting transforms the jellyfish into a completely different spectacle
The open working area at Sumida Aquarium, where visitors can get up close with marine life
Japanese children enthusiastically chatting with Sumida Aquarium staff
After the nightclub-vibes jellyfish zone, you're welcomed into the coral reef section, featuring several upright tanks. The undisputed stars here are the adorably dopey garden eels. The Editor found it oddly amusing: during a dive, the moment you get anywhere close to garden eels they shyly retreat into the sand — yet through the aquarium glass, you can observe them at an almost impossibly close range. Incredibly cute! Nearby, there's also a small sea turtle rehabilitation tank, where a little turtle is slowly growing up among the sargassum seaweed. Hopefully one day it will make its way to the "Tokyo Grand Tank," which we'll get to shortly.
The coral reef exhibit at Sumida Aquarium
Adorable garden eels
This would be a fantastic spot to practice macro photography
A little sea turtle growing up slowly among the sargassum
Must-See Highlights at Sumida Aquarium
After your encounter with the garden eels, it's time for the true showstoppers at Sumida Aquarium — the Tokyo Grand Tank and the Penguin Zone! The Tokyo Grand Tank recreates the underwater ecosystem of the Ogasawara Islands, Tokyo's only UNESCO World Heritage Site located some 1,000 km from the city. The massive tank is home to 500 fish across 55 different species, offering a window into the wonders of the natural world. The Penguin Zone is one of Japan's largest indoor open-air penguin enclosures, using lighting to simulate the progression from dawn through day, dusk, and night — allowing these charming visitors from a faraway land to live comfortably in a naturalistic setting. Once inside, be sure to check the feeding schedule: watching the penguins being fed up close is absolutely adorable!!
Sumida Aquarium's open-air penguin zone offers remarkably close encounters
The feeding show has begun!
You can get up close and personal with the penguins
The Grand Tank is home to a remarkable variety of species — you could easily sit and zone out in front of it for half an hour
Sumida Aquarium's Special Exhibition — Just How Complicated Are Penguin Relationships?
Beyond the animal displays, the exhibits reveal the meticulous attention to detail that defines Japanese culture. There's even an elaborate chart mapping out all the tangled relationships between the penguins — guaranteed to raise a smile — alongside interactive installations and artistic lighting that set this aquarium apart from anything you've seen before. Kids could easily spend half a day here!
The intricate penguin relationship chart inside Sumida Aquarium
The small details reveal the meticulous care the Japanese put into curation
Interactive installations are a hit with kids and add brilliantly to the atmosphere
The children's play area — a welcome rest stop for mums and dads
And finally, let's wrap things up with some beautifully crafted Japanese ocean-themed souvenirs~
Beyond Sumida Aquarium, Tokyo has other aquarium options — though distance becomes an added consideration. Sumida Aquarium may be on the smaller side, but sitting right beneath Tokyo Skytree and just a short distance from Asakusa, it slots perfectly into a full day of sightseeing as a complementary stop. We've included links to other Tokyo aquariums below as well!
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