The Northern Mariana Islands are a U.S. federation in the Pacific Ocean. Saipan, the biggest island, is known for its sandy shores and uneven scenes. In clean waters up its west coast is the small, coral-bordered Mañagaha islet. On Saipan's upper east coast, turtles occupy the Grotto, a cave plunge site. Close by, remembrances mark Banzai Cliff and Suicide Cliff, locales from WWII's Battle of Saipan.