The Marianas are a group of 15 islands located in the western Pacific Ocean. The four crossword solutions for the term ONE OF THE MARIANAS are Guam (4 letters), Saipan (6 letters), ROTA (4 letters), and Tinian (6 letters). Guam is the largest and most populous island in the Marianas, while Saipan is the second largest and most developed. ROTA is the third largest island in the Marianas, and Tinian is the fourth largest.