Mount Semeru is the highest volcano in Java, with Mahameru peak, 3,676 meters above sea level (masl). The crater at the summit of Mount Semeru known Jonggring Saloko. Semeru has Hill Dipterokarp forest area, forest Dipterokarp Top, Montain forest, and forest Ericaceous or mountain forest. The position is located in the mountains between the administrative area Malang and Lumajang, with geographical position between 8 ° 06 'south latitude and 120 ° 55' east longitude. In 1913 and 1946 Crater Jonggring Saloka have dome with a height of 3744.8 Meters until the end of November 1973. It takes about four days to climb the peak of Mount Semeru round-trip. To climb the mountain semeru can be reached via the town of Malang orLumajang. By using the jeep journey starts from Tumpang to Ranu Pani, the last village at the foot of Semeru. Climbers could also spend the night at the guard post. In Pos Ranu Pani also there are two lakes namely Ranu Pani and Ranu Regulo which lies at an altitude of 2,200 masl.