Den Blå Planet – National Aquarium Denmark

An underwater universe on the edge of Copenhagen

Den Blå Planet rises from the Kastrup shoreline like a swirling whirlpool of metal and glass, its fluid curves inspired by the movement of water and schools of fish. Inside, the building opens into a dramatic central hall where different “water worlds” spiral outwards, drawing you deeper into a self-contained marine universe. With around 7 million liters of water across its tanks and thousands of animals from Denmark and far beyond, this is one of Northern Europe’s largest and most ambitious aquariums. From the moment you step in, there is a sense of immersion. Low lighting, shimmering reflections and the constant play of ripples on the walls create the feeling of being just beneath the surface. The design is intuitive: follow the flow and you move from cold northern seas to tropical oceans, freshwater lakes, and humid rainforest zones without quite noticing the transitions.

Signature tanks, sharks overhead and swirling schools

The star of Den Blå Planet is the enormous Ocean Tank, a vast space where sharks, rays and large schooling fish glide through blue depths. A long tunnel cuts through the water, so you can watch animals pass above and alongside you, a favorite moment for children and adults alike. Floor-to-ceiling windows reveal shifting scenes: rays “flying” over the sand, groupers lurking in rocky crevices, silvery shoals moving as a single living cloud. Elsewhere, smaller but carefully themed tanks showcase coral reefs in vivid color, with clownfish, moray eels and other tropical species weaving through branching corals. Nordic habitats highlight cod, flatfish and local marine life, connecting the aquarium directly to the waters of the Øresund just outside. Informative displays, models and digital screens explain ecosystems, adaptations and conservation challenges in clear, accessible language.

Rainforest heat, rescued sea otters and hands-on encounters

One wing recreates a warm, misty rainforest. Here you step into a dense green world of dripping foliage, where birds call from branches and tanks hold everything from piranhas and armored catfish to freshwater rays. The air is noticeably humid, a sensory contrast to the cool northern sea galleries. Look closely and you may spot reptiles or amphibians hiding among roots and leaves, emphasizing how water shapes life far from the coast. Outside, one of the aquarium’s most distinctive residents takes the stage: sea otters. Den Blå Planet is among the few places in Europe where you can see these charismatic animals, all of them rescues that could not survive in the wild. Their pool and rocky shoreline-style habitat invite lingering, as the otters tumble, groom and play with enrichment toys. Touch pools and hands-on stations, where staff often present crabs, starfish or other hardy species, give younger visitors the thrill of safe, supervised contact with marine life.

Architecture, seafront setting and everyday atmosphere

Beyond the tanks, Den Blå Planet’s architecture is an attraction in itself. Seen from above, the building’s wings spiral around a central hub like eddies in a current, and the exterior cladding mirrors the color of the sea and sky. Large glazing opens onto views of the Øresund Strait, and on clear days you can see planes descending towards Copenhagen Airport while fish glide past behind the glass. The aquarium’s location on the waterfront means that the experience naturally spills outdoors. In warmer months, families gravitate to the water playground and shallow pools where children can splash, while adults appreciate the fresh sea breeze and open horizon. Indoors, the atmosphere is generally lively but manageable, with quieter corners near smaller exhibits and in the café, which overlooks the strait and makes a convenient pause between galleries.

Planning your visit and making the most of your time

Den Blå Planet is open year-round, typically from mid-morning to late afternoon, with extended evening hours on Mondays and during peak holiday periods. Tickets are timed, and buying in advance is strongly encouraged, especially on weekends and school holidays when time slots can sell out. Standard admission places the aquarium in a mid to upper price range for Copenhagen attractions, but you can stay as long as you like once inside. Most visitors allow around two to three hours to explore the main exhibits at a comfortable pace, but enthusiasts can easily spend longer watching feedings and scheduled talks. The building is fully accessible, with level access, lifts and wide walkways suitable for wheelchairs and strollers. On site you will find restrooms, changing facilities, lockers, a shop and café. Located close to the airport and metro, and right by the water, Den Blå Planet slots easily into a day of urban sightseeing while offering a complete escape into the underwater world.