Being the largest volcanic region in the province, Bromo Tengger Semeru National Park covers a massive area of 800 square km in the center of East Java. Visitors who have an eager interest in volcanic activities must come to the park and witness the smoke of ashes coming from Mount Semeru, an active volcano that rises 3,676 meters above sea level.
Bromo Tengger Semeru National Park is the only conservation area in Indonesia that has a 10 km sea of sand called Tengger, from which four new volcanic cones have emerged. Those volcanic cones are Mount Batok (2,470 m), Mount Kursi (2,581 m), Mount Watangan (2,661 m), and Mount Widodaren (2,650 m). However, Mount Bromo is still the only one that is active. Temperatures at the top of Mount Bromo range about 5-18 degrees Celsius. Heading south of the park is a rolling upland plateau divided by valleys and decorated with several scenic lakes reaching to the foot of Mount Semeru.