the Strait of Madura. Bawean Island is located about 150 km north of Java. In the east of Madura there are clusters of islands, the easternmost are the Kangean Islands and the northernmost are the Masalembu Islands. Off the south coast of Java there are two small islands namely Nusa Barong and Sempu Island. Geology In physiographic of geology, East Java Province can be grouped into three zones: the southern zone (plato), the middle zone (volcanic), and the northern zone (folds). Lowlands and highlands in the middle (of Ngawi, Blitar, Malang, to Bondowoso) has a fairly fertile soil. In the northern part ( Bojonegoro, Tuban, Gresik, to Madura Island) lies the Kapur Utara mountains and the Kendeng mountains which are relatively barren. In the middle of the province stretch mountain ranges and volcanoes: On the border with Central Java is Mount Lawu (3,265 metres). Southeast from Madiun is Mount Wilis (2,169 metres), and Mount Liman (2,563 metres). In the middle of the corridor lies the Anjasmoro mountains with peaks Mount Arjuno (3,339 metres), Mount Welirang (3,156 metres), Mount Anjasmoro (2,277 metres), Mount Kawi (2,551 metres), and Mount Kelud (1,731 metres); The mountains are located in most Kediri, Blitar, Malang, Pasuruan, Mojokerto and Jombang. The group has the peak of Mount Bromo Tengger (2,329 metres), and Mount Semeru (3,676 metres). Mount Semeru, which is also called Mahameru is the highest mountain in the island of Java. In the easternmost part if the province, there are two groups of mountains: the Iyang mountains with the peak Mount Argopuro (3,088 metres), the Ijen mountains with the peak Mount Raung (3344 metres) In the south there is a series of hills, that of the south coast of Pacitan, Trenggalek, Tulungagung, Blitar, Malang. the Kapur Selatan mountains is a continuation of a series of the Sewu mountains in Yogyakarta. Water Two of the most important rivers in East Java is the Brantas River (290 kilometres), and the Solo River (548 kilometers). Brantas River has headwaters on the slopes Mount Arjuno near Batu, and flows through most areas in East Java, like Malang, Blitar, Tulungagung, Kediri, Jombang and Mojokerto. In Mojokerto, Brantas River split into two: Kali Mas, and Porong; both empties into the Madura Strait. Solo River has headwaters on the slopes of Mount Lawu which lies on the border of East Java and Central Java, and flows through a portion of the eastern part