Java and Bali to the east. Borneo lies to the north and Christmas Island is to the south. It is the world's 13th largest island. Java is surrounded by the Java Sea to the north, Sunda Strait to the west, the Indian Ocean to the south and Bali Strait and Madura Strait in the east. Java is almost entirely of volcanic origin; it contains thirty-eight mountains forming an east–west spine that have at one time or another been active volcanoes. The highest volcano in Java is Mount Semeru (). The most active volcano in Java and also in Indonesia is Mount
1994 Java earthquake 1994 Java earthquake The 1994 Java earthquake occurred on June 3 at off the coast of Indonesia. The epicenter was off the eastern part of the southern Java coast, near the east end of the Java Trench. This earthquake occurred with a moment magnitude of 7.8 in a region which is characterized as having a weak seismic coupling. Earthquakes with slow rupture velocities are the most efficient tsunami generators, and this earthquake was classified as a tsunami earthquake. The tsunami reached Java and Bali, with runups up to on the east Java coast and up to on the southwestern Bali