The Green Dolphin Street Prison (グリーン・ドルフィン・ストリート刑務所 Gurīn Dorufin Sutorīto Keimusho), also known as The Aquarium (水すい族ぞく館かん Suizokukan),[1] is the main setting of the first part of Stone Ocean. It appears to be a unisex prison, though the genders are separated by the prison dorms.