Bromo Ijen Craters are the natural phenomena. They are part of the ring of fire in Indonesia which is connected from the plates of Asia, Pasific and Australia. Bromo and Ijen Craters are still active volcanoes which can be reach easily by tourists. The peak of bromo moutain is at 2,329 meters (7,641 ft) it is not the highest peak of the massif, but is the most well known. The massif area is one of the most visited tourist attractions in East Java, Indonesia. The volcano belongs to the Bromo Tengger Semeru National Park. The name of Bromo derived from Javanese pronunciation of Brahma, the Hindu creator god.
Ijen volcano complex or Ijen crater complex is a group of composite volcanoes in the Banyuwangi Regency of East Java, Indonesia. It is inside a larger caldera Ijen, which is about 20 kilometres wide. Many other post-caldera cones and craters are located within the caldera or along its rim. The largest concentration of post-caldera cones run east-west across the southern side of the caldera. The active crater at Kawah Ijen has a diameter of 722 metres (2,369 ft) and a surface area of 0.41 square kilometers (0.16 sq mi). It is 200 meters (660 ft) deep and has a volume of 36 cubic hectometers (29,000 acre⋅ft). The lake is recognized as the largest highly acidic crater lake in the world. Ijen crater is also famous with the blue fire mountain, which can be seen as a tourist attraction.
There so many tour operators sells Bromo tour from other cities like Yogyakarta, Surabaya and Malang. Bromo tour and the packages have many variations and types. Bromo tour from Yogyakarta can done by overland (car / train) which is combined with other cultural tors and activities. Most tourists and travelers starts traveling from Yogyakarta; visiting Borobudur & Prambanan temples and other great activities (caving, cycling, river rafting art shopping etc.) Then continued to explore Bromo and Ijen craters, some even continue to Bali island.