Kamogawa Sea World, Aquarium in Kamogawa, Chiba Prefecture, Japan

Kamogawa Sea World is a public aquarium between Tojo Beach and National Route 128 in Kamogawa, Chiba Prefecture. Its long east-west grounds hold four performance stadiums, the Eco Aquaroam, Tropical Island with a 7.5-metre-deep tank, and Rocky World, whose lower level shows skeletons of an orca, a megamouth shark and a walrus. The main gate faces a gift shop, the Marine Market.

Yashima Kanko Co., Ltd. opened the aquarium in October 1970, focusing on dolphins, sea lions and the training of killer whales. The 1971 opening of the on-site Kamogawa Sea World Hotel helped turn Kamogawa into a year-round resort. After Yashima Kanko merged into Mitsui Kanko in 1986, the park added Ocean Stadium in 1987, Rocky World and Rocky Stadium in 1998, and Tropical Island in 2001.

The orcas are named Lovey, Lara and Luna; Lovey and Lara are sisters, and Luna is Lovey's daughter. After each Ocean Stadium show, visitors may step to the poolside for a kiss from an orca. A fan club, Dolphin Dream Club, offers discounts on the paid Discovery Guidance tours.

During summer performances, visitors receive protective gear and should bring swimwear, goggles and spare clothes for water-intensive shows. The grounds are easy to explore on foot, with enough time needed to cover all areas.

The Ocean Stadium seats about 2,000 people and was built in 1987 specifically for orca performances. Its lower level houses the Restaurant Ocean, where diners watch orcas swim through underwater windows. The stadium also displays an FRP replica of "Jumbo", the first orca ever kept in Japan.