Photos taken within the Bromo Tengger Semeru National Park, located in East Java, Indonesia. It is the only conservation area in Indonesia that has a sand sea, the Tengger Sand Sea (Indonesian: Laut Pasir Tengger), across which is the caldera of an ancient volcano (Tengger) from which four new volcanic cones have emerged. This unique feature covers a total area of 5,250 hectares at an altitude of about 2,100 metres (6,900 ft). The massif also contains the highest mountain in Java, Mount Semeru (3,676 m), four lakes and 50 rivers. It is named after the Tengger Kingdom.The Tengger Sand Sea has been protected since 1919. The Bromo Tengger Semeru National Park was declared a national park in 1982.