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Discover a mystical underwater world nestled in the Hakone mountains, overlooking the serene Lake Ashi from 720m above sea level. Hakone-en Aquarium, Japan's highest-altitude aquarium, offers a unique experience to witness the vibrant lives of aquatic creatures amidst crisp mountain air.
From vast tanks teeming with diverse marine life to the charming performances of our beloved seal mascots, create unforgettable memories with family, partners, or friends amidst Hakone's natural beauty.

A Unique Marine Ecosystem, Closest to the Clouds
Located 720m above sea level, this is Japan's highest and most unique aquarium, showcasing approximately 450 species and over 30,000 marine creatures.

Japan's Highest Aquarium Experience
Enjoy an extraordinary encounter with marine life high in the mountains, touching the blue sky. Explore the underwater world at your own pace, surrounded by Hakone's pristine natural landscapes.

Meet 30,000 Underwater Friends
Marvel at the diverse array of marine life, with around 450 species swimming in expansive tanks. From colorful tropical fish to uniquely captivating sea creatures, every corner offers a visual feast, bringing out the child in everyone.

Captivating Seal Show!
Don't miss the entertaining and intelligent performances by Hakone-en Aquarium's beloved seals. Witness their playful antics with their trainers, recharge with their vibrant energy, and capture unforgettable moments.
"It's the most unique and peaceful healing spot, where you can interact with adorable seals while breathing Hakone's fresh mountain air."
Operating Hours:
09:00 ~ 16:30 (Last admission at 16:00)
※ Operating hours may vary depending on the season. Please check the hours in advance.
※ For information on facility events, please check the official website.
139 Motohakone, Hakone, Ashigarashimo District, Kanagawa 250-0522 일본