East Java is a province of Indonesia located in the easternmost third of Java island. It has a land border only with the province of Central Java to the west; the Java Sea and the Indian Ocean border its northern and southern coasts, respectively, while the narrow Bali Strait to the east separates Java from Bali by around 2.29 kilometres (1.42 mi). Located in eastern Java, the province also includes the island of Madura, as well as the Kangean islands and other smaller island groups located further east and Masalembu archipelagos in the north. Its capital is Surabaya, the second largest city in Indonesia, a major industrial center and also a major business center. Banyuwangi is the largest regency in East Java and the largest on the island of Java.
The Indonesian island of Java is almost entirely of volcanic origin, and contains numerous volcanoes, 45 of which are considered active volcanoes. As is the case for many other Indonesian islands, volcanoes have played a vital role in the geological and human history of Java. Indeed, land is created on Java as a result of lava flows, ash deposits, and mud flows (lahars). Volcanoes are a major contributor to the immense fertility of Java, as natural erosion transports volcanic material as alluvium to the island's plains, forming thick layers of fertile sediment. The benefit is not just in the immediate vicinity of the volcano, with fine ash emitted from eruptions being dispersed over wide areas.
The Bromo, or Mount Bromo is an active somma volcano and part of the Tengger mountains, in East Java, Indonesia. At 2,329 meters (7,641 ft) it is not the highest peak of the massif, but is the most active and famous. The area is one of the most visited tourist destinations in East Java, and the volcano is included in the Bromo Tengger Semeru National Park. The name Bromo comes from the Javanese pronunciation of Brahma, the Hindu god of creation. At the mouth of the crater, there is an idol of Ganesha, the Hindu god of wisdom which is being worshipped by the Javanese Hindus. Mount Bromo is located in the middle of a plain called "Sea of Sand", a nature reserve that has been protected since 1919.
The Tenggerese people are a sub-ethnic group of Javanese in eastern Java who claim to be the descendants of the Majapahit princes. Their population of roughly 100,000 is centered in 30 villages in the isolated Tengger mountains in the Bromo Tengger Semeru National Park in eastern Java.
The Semeru, or Mount Semeru is an active volcano located in East Java, Indonesia. It is located in a subduction zone, where the Indo-Australian plate subducts under the Eurasia plate. It is the highest mountain on the island of Java. The name "Semeru" is derived from Meru, the central world mountain in Hinduism, or Sumeru, the abode of gods. This stratovolcano is also known as Mahameru, meaning "The Great Mountain" in Sanskrit. It is one of the more popular hiking destinations in Indonesia.
A somma volcano, also known as a sommian, is a volcanic caldera that has been partially filled by a new central cone. The type is named after Mount Somma ("Summit"), a stratovolcano in southern Italy with a summit caldera in which the upper cone of Mount Vesuvius has grown. Other examples of somma volcanoes can be found on Russia's Kamchatka Peninsula and the Kuril Islands, stretching south from Kamchatka to Hokkaidō, Japan.
Mount Lamongan or Mount Lemongan is a small stratovolcano located between the massif Tengger caldera complex and Iyang-Argapura volcano complex in East Java, Indonesia. The volcano is surrounded by maars and cinder cones. The volcano's high point is locally named as Gunung Tarub. Lake-filled maars including Ranu Pakis, Ranu Klakah and Ranu Bedali, located on the eastern and western flanks. The northern flanks are dominated by dry maars.
Mount Gede Pangrango National Park is a national park in West Java, Indonesia. The park is centred on two volcanoes—Mount Gede and Mount Pangrango—and is 150 km² in area.
Anaphalis javanica, the Javanese edelweiss, is a species of flowering plant native to Indonesia. It is found mostly in mountainous regions of Java, southern Sumatra, southern Sulawesi and Lombok. Although a mature plant can reach eight metres in height, most specimens are less than a metre tall. It is a pioneer in recent volanic land. The flower are generally seen between April and August. A bird species, the Javan whistling thrush, nests in the plant's branches.
Ranu Kumbolo is a mountainous lake located in Bromo Tengger Semeru National Park, East Java, Indonesia. The lake is part of easiest route from Ranu Pani to Mount Semeru peak.
Tenggerese is a language used by the Tenggerese people in the mountain region of the Bromo Tengger Semeru National Park which includes Pasuruan Regency, Probolinggo Regency, Malang Regency and Lumajang Regency of East Java, Indonesia.
Yadnya Kasada, also known as Kesodo, is a traditional Hindu ritual of the Tenggerese people, an ethnic subgroup of the Javanese. The ritual serves as a way of expressing appreciation to their gods, whom they believe have granted them with blessings, abundance, and welfare.
Ranu Pani or Ranupani is a volcanic lake in Ranu Pani Village, Senduro District, Lumajang Regency, East Java. Ranu Pani is part of the Bromo Tengger Semeru National Park (TNBTS). Initially, the area of Ranu Pani was around one hectare, but now it is estimated to be only 0.75 hectares due to the rapid sedimentation rate. The population of Ranu Pani is around 2,000 people.
Mount Batok is a cinder cone located in East Java, Indonesia. This volcano has an elevation of 2,440 metres (8,005 ft) above sea level, and is located between four regencies: Probolinggo Regency, Pasuruan Regency, Lumajang Regency, and Malang Regency. The location of Mount Batok is west from Mount Bromo. This mountain is one of the inactive volcanoes located within the Tengger caldera. Mount Batok is part of Bromo Tengger Semeru National Park.
Greater Malang is a region in East Java, Indonesia, encompassing the municipality of Malang and its hinterland. Over 3 million people in East Java came from Greater Malang. The principal city, Malang is well known as the home of notable universities in Indonesia, and its suburb, Batu, is well known as a tourism centre in East Java.
The Eastern Java–Bali montane rain forests ecoregion covers the higher altitude mountain rainforests on the eastern side of the island of Java, and most of the center of the island of Bali in Indonesia. The region has a number of active volcanoes, but is under pressure from growing human populations pushing into higher elevations and more marginal land. With elevations rising from sea level to 3,426 metres (11,240 ft), and precipitation varying between rainforest and drier forest levels, the area has many different forest types – evergreen, deciduous and semi-alpine.
An eruption of Mount Semeru, a volcano in the East Java province of the Indonesian island of Java, began on 4 December 2021. The eruption began after heavy precipitation caused the collapse of the lava dome at the summit. Pyroclastic flows and lahars damaged at least 5,205 homes and several public buildings. At least 69 people died, 104 more were injured, while more than five remain missing.
