Beneath the sand sea, seven eruption center have been found along two intersecting lines, one from east to west and the other from northeast to southwest. From those northeast-southwest line emerged mount Bromo, an active volcano which intermittently emits smoke and ash, and is an ever-present threat to the lives of some 3,500 people living below. The crater of mount Bromo has a diameter of about 800 meters from north to south and 600 meters from east to west. Most of the area within a radius of 4 km from the crater centers is considered hazardous. The Tenggerese people that live around the park are indigenous to the area and adhere to ancient Hindu beliefs. According to the legend, the ancestors of the tribe were members of the Majapahit kingdom who went into exile. Strangely, despite being aware of the potential dangers of mount Bromo, the local people seem unafraid.
The same goes for the visitors who come to the park in great numbers, particularly around the time of the "Kasodo Ceremony". The ceremony is held every year (December/January) at the full moon. Through this ceremony, the Tenggerese invoke the blessings of the deities to ensure an abundant harvest, to be spared from calamity and to be cured of various diseases. To earn such blessings, they climb down the sides of the crater to catch the offerings thrown into the crater by other members of the community above. The scramble for possession of the 'sacrifices' is at once a gripping, but terrifying sight: it is not uncommon for some of the participants to tumble down to the crater's floor.
- Cemoro lawang: it is one of entrance gates through which visitors pass to see the expanse of the sand sea and Bromo crater from a distance; camping is possible here.
- Tengger sand sea: climbing up concrete steps to the rim of mount Bromo's crater and witnessing the sunrise.
- Mount Pananjaan: viewing a magnificent panorama of mount Bromo, mount Batok and mount Semeru.
- Ranu Darungan lake: camping and observing animals and plants; incredible views.
Best time to visit is in June to October, and December to January.
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