Oita Marine Palace Aquarium “Umitamago”

The Oita Marine Palace Aquarium, commonly known as Umitamago, originally opened in 1964 as the Oita Marine Palace Ecological Aquarium and was significantly renovated and reopened on April 1, 2004. The aquarium achieved pioneering status as the world's first facility to feature a tidal current type migration tank, and for seven years following its opening, it attracted more visitors than any other aquarium in Japan. The name translates to "sea egg" and reflects the concept that all life originated from the ocean.

Located on the Takasaki Yamashita Coast along Beppu Bay, approximately 1.8 kilometers from the Beppu city border, the facility operates under the theme of becoming friends with animals. The centerpiece is a massive 1,250-ton migration tank showcasing approximately 90 species and 1,500 fish native to the Bungo Channel. The aquarium spans two floors plus an outdoor beach area, featuring distinct zones including the River Zone, Tropical Zone with coral tanks, Frigid Zone housing walruses and seals, and a Science Zone for marine life experiments.

Visitor experiences center on close animal interactions through daily performances and hands-on activities. The aquarium pioneered Japan's first sea otter show in 1990, and today's popular entertainment includes dolphin performances known for powerful jumps and walrus shows featuring trained animals performing with handlers. The outdoor Asobeach facility allows visitors to enter a pool with white coral sand barefoot to observe dolphins swimming freely. Touch pools throughout the facility enable direct contact with rays, starfish, and sea cucumbers. The aquarium also offers behind-the-scenes tours providing access to operational areas normally closed to the public.

Admission fees are ¥2,600 for high school students and adults, ¥1,300 for elementary and junior high school students, ¥850 for children aged 4 and older, and ¥2,000 for seniors. Children under 3 enter free. The aquarium connects directly to the adjacent Takasakiyama Monkey Park via footbridge, and a combined Monkey Marine Ticket is available for ¥3,300, including round-trip bus transportation from Beppu or Oita Station plus admission to both facilities.

From Oita Station, take an Oita Kotsu bus bound for Beppu and disembark at the Takasakiyama stop. From Beppu Station, take bus number AS60 or AS61 bound for Oita Station, with the journey taking approximately 10 minutes and costing ¥280. The aquarium is a short walk from the bus stop. Two gift shops sell original merchandise, plush toys, and local specialty items, while the on-site Umitama Café Bee Honey serves marine-themed dishes with panoramic views of Beppu Bay.