Ariake Coliseum is an indoor sporting arena, located in Ariake, Tokyo, Japan. It is situated at the heart of Ariake Tennis Forest Park and is counted amongst Japan’s main tennis venues that have been employed for Japan Open Tennis Championship and Toray Pan Pacific Open. The maximum seating capacity of the venue is 10,000. The stadium gives a fine example of architecture with a retractable roof which pre-dates the one at Wimbledon in London. The Ariake Coliseum is built within the Ariake Tennis Forest as an indoor tennis park. The stadium also hosts rounds of the WTA Pan Pacific Open, a women's tennis tournament.