sentences:  Izu–Bonin–Mariana Arc
  
  The Izu–Bonin–Mariana (IBM) arc system is a tectonic-plate convergent boundary.The IBM arc system extends over 2800 km south from Tokyo, Japan, to beyond Guam, and includes the Izu Islands, Bonin Islands, and Mariana Islands; much more of the IBM arc system is submerged below sealevel.