Yu Shan or Yushan, also known as Mount Jade, Jade Mountain, or Mount Yu, and known under Japanese rule as Mount Niitaka, is the highest mountain on Taiwan at above sea level, giving Taiwan the 4th-highest maximum elevation of any island in the world. It is the highest point in the western Pacific region outside of the Kamchatka Peninsula. Yushan and surrounding mountains belong to Yushan Range. The area was once in the ocean; it rose to its current height because of the Eurasian Plate's movement over the Philippine Sea Plate.