Sankakusu

Sankakusu (三角州; Delta) was a commercial district in Tokyo built on an artificial island in Tokyo Bay. Sankakusu was the location of the Death Busters' headquarters, Mugen Academy, and Professor Souichi Tomoe's lab in the Infinity arc of the manga and Sailor Moon S season of the anime.

Trivia

• This area was the "delta zone" referred to in the Sera Myu song "Triangle Secret!".