Every time someone tells me they’re doing the Lotte World Tower observation deck, I ask if they’ve budgeted time for the aquarium underneath it. Most people forget it’s even there. It’s tucked into the basement level of the Lotte World Mall complex in Jamsil, completely separate from the tower elevators, and you can easily walk past the entrance without noticing it.
I’ll be upfront: I’m not usually an aquarium person. I find most of them a bit repetitive after you’ve seen a few — same jellyfish tanks, same touch pools, same gift shop selling plush sharks. But Lotte World Aquarium surprised me a little, mostly because of scale. This isn’t a small municipal aquarium. It’s a genuinely large, well-funded facility built to compete with COEX Aquarium across the river, and honestly it does a better job in a few specific ways.
Getting There and Ticket Prices
The aquarium sits on the B1 floor of Lotte World Mall, right next to Jamsil Station (Line 2 or 8, exit 1 or 2, then follow the signs — it’s a longer underground walk than you’d think, closer to ten minutes). You don’t need a combo ticket with the tower or Lotte World theme park, though they do sell bundles if you’re doing more than one thing that day.
Standalone adult tickets run somewhere in the 29,000–33,000 KRW range depending on the season and whatever promotion is running — it changes often enough that I won’t quote an exact number here, so check the current price before you go rather than trusting anything you read online, mine included. Kids and seniors get a discount. Buying online ahead of time through the official site or through Klook/Trazy usually shaves off a few thousand won and, more importantly, skips you past the ticket counter line on weekends.
Weekday mornings are dead quiet. Saturday afternoons, especially during school holidays, get genuinely crowded — strollers everywhere, kids pressed up against the glass, that kind of thing. If you want photos without twenty people in the background, go on a weekday before noon.
The B1 location is doing more work than it sounds like. You reach it from inside Lotte World Mall, which connects underground to Jamsil Station, so on a day of heavy rain or serious August heat you can go from train to aquarium to lunch without stepping outside once. That is a genuinely useful thing to have filed away for a bad-weather afternoon. It also means the tower, the theme park and the lake are all a walk away rather than another subway ride, so combining them is a decision about your feet, not your transit card.
What’s Actually Worth Seeing
The main draw is the huge ocean tank near the end of the route, with a walk-through tunnel that curves overhead so fish and rays pass right above you. It’s genuinely impressive, and unlike some tunnel tanks I’ve been in elsewhere, this one is wide enough that you’re not just shuffling through in a single-file line — you can actually stand and look up for a minute without someone bumping into you.
There’s also a section with a moon jellyfish display lit up in shifting colors that’s probably the most Instagrammed corner of the whole place, and a penguin habitat that’s smaller than you’d expect but well maintained. The sea otters near the start tend to be the most active in the late morning feeding window — worth timing your visit around if you check their posted feeding schedule at the entrance.
What I didn’t love: the touch pool area feels a bit tired, and some of the smaller tanks toward the middle of the route are easy to walk past without really registering what’s in them. It’s not a criticism unique to this place — most big aquariums have a stretch like this — but don’t expect every section to hit the same level as the main tank.
Pace matters more than route here. At a normal walk it is about an hour, ninety minutes if you actually stop, and the layout runs one way — doubling back to something you liked is awkward rather than impossible. So linger when you are standing in front of it instead of telling yourself you will come back at the end. The big tank sitting near the end of the route is good design, the best thing last, but it does mean the early rooms are where people rush when they shouldn’t.
The Beluga Whale Question
I should mention this because people ask, and because it matters. For years, Lotte World Aquarium kept a beluga whale named Bella in a tank that animal welfare groups argued was far too small for a species that swims long distances in open ocean in the wild. It became a fairly well-known controversy in Korea, with protests and petitions pushing for her release or transfer. As of recent years the facility has moved away from keeping belugas on permanent display, following public pressure, though policies and exhibits do shift over time. If this is something you care about — and I think it’s fair to care about it — it’s worth doing a quick search for the current status before you go, since I don’t want to give you outdated information here.
If this is the kind of thing that would change whether you go, check the aquarium’s own current announcements before you buy a ticket rather than trusting any article, this one included. The situation there has changed more than once, and travel writing about captive animals goes stale faster than almost anything else on a page like this. I would rather point you at the source than have you arrive expecting something that is no longer true in either direction.
Lotte World Aquarium vs. COEX Aquarium
People ask me this constantly since both are in Seoul and both get lumped together in “top things to do” lists. My honest take: Lotte World Aquarium has the better big tank and the better tunnel experience. COEX Aquarium is smaller, a bit more dated in its displays, but it’s attached to Starfield Library and the whole COEX underground complex, so it fits more naturally into a half-day wandering around Gangnam. If you only have time for one and you’re near Jamsil anyway — for the tower, the theme park, or the mall — go with Lotte World’s. If convenience and combining it with a bookstore visit matters more, COEX works fine too.
Neither is a must-do the way Gyeongbokgung or a street food market is. Think of it as a solid rainy-day option or something to pair with the tower observation deck rather than a dedicated trip across the city.
For what it is worth, both sit on Line 2 — Jamsil and Samseong are a few stops apart — so doing the two in one day is entirely possible. It is also fairly pointless. You would be looking at the same kinds of fish twice with a train ride in between, and whichever one you saw second would suffer for it. Pick the one whose neighbourhood you were going to be in anyway and spend the saved afternoon on something that is not behind glass.
Practical Notes
- Budget 1.5 to 2 hours if you’re walking through at a normal pace and actually reading the signs.
- Strollers are fine — the paths are wide and mostly flat.
- There’s no real natural light inside, so if you’ve got small kids who get antsy in dim spaces, pace yourself.
- Lockers are available near the entrance if you’re carrying shopping bags from the mall.
- English signage is decent throughout, better than a lot of Korean attractions outside central Seoul.
It’s not going to be the highlight of your Korea trip, but if you’re already spending a day at Lotte World Tower and the weather turns bad, it’s a perfectly good way to fill a couple of hours without feeling like you wasted the ticket price.
A few last things that are only obvious once you are down there. The tanks are dim and the glass throws reflections, so turn the flash off — it does nothing for the photo and it is unkind to the animals — and put the lens flat against the glass instead. Eat before you go in rather than planning to duck out and come back. And it is noticeably cooler down there than in the mall above, which is a small mercy in August and a reason to have a layer with you in winter.
Read next
- Samsung Station and COEX Mall: The Underground City Under Gangnam — The mall it sits under, and the one it competes with.
- Where to Leave Your Bags in Seoul: Lockers, Prices, and What Actually Fits — Where to put your bags first.
- T-Money Card in Korea: Where to Buy It, Where to Use It, and How to Get a Refund — Getting there on the card everyone uses.