The Bromo Tengger Semeru National Park covers a massive area of 800 square kilometres in the centre of East Java. For anyone with an interest in volcanoes, a visit to the park is a must. This is the largest volcanic region in the province. Visit the park and see the plumes of smoke coming from Mt. Semeru, an active volcano which rises 3676 meters above sea level.
Experience the remarkable Tengger Caldera, Java’s largest, with its 10 km barren desert-like sea of sand. Within the caldera rise the deeply fissured volcanic cones of Batok and Bromo, the latter is still active with a cavernous crater from which smoke blows skyward. Temperatures at the top of Mount Bromo range about 5 to 18 degrees Celsius. To the south of the park is a rolling upland plateau dissected by valleys and dotted with several small scenic lakes, extending to the foot of Mount Semeru.
The Tengger sandy area has been protected since 1919. This is believed to be the only conservation area in Indonesia, and possibly the world which possesses a unique sand sea at the attitude of about 2000 m above sea level. There are several mountains inside the caldera: Mt Watangan (2,661 m asl). Mt Batok (2,470 m asl), Mt Kursi (2,581 asl), Mt Watangan (2,661 m asl), and Mt Widadaren (2,650 m asl). With beautiful scenery, easy access and visitor-oriented facilities, it’s no wonder that this one of the most popular reserves in Java.
Taken from Indonesia.travel