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
1943 Central Java earthquake Surakarta in the east. Alone in Bantul, there were 31 people dead, 564 people injured, and 2,682 houses collapsed. 1943 Central Java earthquake The 1943 Central Java earthquake occurred on July 23 at 14:53:10 UTC with a moment magnitude of 7.0 near Java, which was under Japanese occupation. The Yogyakarta depression area is mostly covered by alluvium and the volcanic deposit of Mount Merapi. The Yogyakarta depression area is located between the volcanic arc of the Central Java and the Java Trench. The earthquake affected the Yogyakarta depression area in Central Java. It caused about 213 deaths and over 3,900