CNA Arena Akita is an arena in Rinkai-area, Akita, Japan. It is owned and run by the city.Cable Networks Akita acquired its naming rights in 2015. The silver-colored building opened in 1994 and holds 5,000 people. The gym has a dome-shaped 154 feet height ceiling, and added 2,088 extra seatings in 2016. It is the home arena of the Akita Northern Happinets of the B.League, Japan's professional basketball league. The biggest basketball court in Akita is Akita Prefectural Gymnasium.