Mount Bromo: het spectaculaire vulkaanlandschap van Java

Location: Mount Bromo rises to an elevation of 2,329 metres in eastern Java, Indonesia. The active volcano lies within the vast Tengger Caldera, which forms part of Bromo Tengger Semeru National Park. The mountain village of Cemoro Lawang, situated on the rim of the caldera, is a popular starting point for visitors.

Significance: Mount Bromo is one of Indonesia’s best-known natural attractions and a major tourist destination on Java. Its most distinctive feature is its setting within the Tengger Caldera, surrounded by a vast sea of sand, with its smoking crater and neighbouring volcanic mountains.

Geological Formation: Mount Bromo is part of the Tengger volcanic complex, which began forming around 820,000 years ago. Over time, several large volcanoes and enormous calderas formed as volcanic structures collapsed. The youngest of these is the Sand Sea Caldera, measuring approximately 9 by 10 kilometres, which developed gradually towards the end of the last ice age and over the following millennia. Several new volcanic cones later emerged on its floor. Mount Bromo is the youngest of them and consists mainly of material ejected during earlier eruptions.

Active Volcano: Mount Bromo is the only volcanic cone within the Sand Sea Caldera that has erupted repeatedly in recorded history. Eruptions have been documented since around 1590. Typical activity includes clouds of gas and steam, ash emissions and explosive eruptions of varying intensity. During periods of increased activity, safety zones are established, and access to the crater rim may be closed.

Crater: Mount Bromo’s crater measures approximately 600 by 700 metres. A staircase with around 250 steps leads up the final steep section to the crater rim. From there, visitors can look directly into the active crater, where gas and steam frequently rise. The smell of sulphur and occasional rumbling are reminders that the volcano remains active.

Sea of Sand: A vast plain of dark volcanic sand and ash stretches around Mount Bromo. Known as Lautan Pasir, meaning “Sea of Sand”, it covers much of the floor of the Sand Sea Caldera. The barren expanse contrasts sharply with the surrounding green slopes and volcanic cones, giving the landscape its distinctive appearance.

Whispering Sands: One section of the Sea of Sand is now officially called Pusung Gedhe and was long known as Pasir Berbisik, meaning “Whispering Sands”. The name became popular through the 2001 Indonesian film “Pasir Berbisik”, which was filmed in the volcanic landscape around Mount Bromo. The name also suits the surroundings, as the wind can blow fine volcanic sand across the dry ground, creating a soft whispering sound.

Mount Batok: The striking Mount Batok rises directly beside Mount Bromo and stands out in many of the area’s famous panoramic views. Its green slopes are deeply carved by erosion gullies, making it noticeably different from its grey, barren neighbour. Mount Batok is one of the youngest volcanic cones in the Sand Sea Caldera. Only Mount Bromo is younger.

Savanna: South of Mount Bromo, the dark Sea of Sand gives way to an expansive grassland landscape with gently rolling hills. The area is now officially called Lembah Watangan and was long known to tourists as Bukit Teletubbies because its green hills resemble the landscape from the children’s television series “Teletubbies”. During the rainy season, the savanna is usually lush green, while in the dry season, the grass gradually turns golden brown.

Sunrise: The volcanic landscape surrounding Mount Bromo is particularly famous for its sunrises. Many visitors travel to viewpoints such as Penanjakan, Lemah Pasar and Mentigen before dawn. From there, the view stretches across Mount Bromo and neighbouring Mount Batok to Mount Semeru, which rises to 3,676 metres and is the highest mountain on Java. The panorama is especially spectacular when mist or low clouds gather over the Sea of Sand in the morning.

Jeep Tours Across the Sea of Sand: Four-wheel-drive vehicles are the main means of transport for many visitors exploring the vast volcanic landscape. They travel across the Sea of Sand, connecting the main viewpoints with Mount Bromo, the Whispering Sands and the savanna. Visitors complete the final section to the crater either on foot or on horseback.

Tengger Culture: The Tengger people live in the region surrounding Mount Bromo and have preserved their distinct cultural traditions. Most Tengger people are Hindu, setting them apart religiously from Java’s predominantly Muslim population. Many of their customs are closely connected to the volcanic landscape. The mountain is considered sacred and continues to play a central role in their religious life.

Name: The name Mount Bromo derives from Brahma, the Hindu god of creation. In the local pronunciation, Brahma gradually became Bromo. The volcano’s name therefore reflects its close connection to the Hindu traditions of the Tengger people.

Pura Luhur Poten: The Hindu temple of Pura Luhur Poten stands in the middle of the Sea of Sand at the foot of Mount Bromo and is an important religious centre for the Tengger people. Built from dark volcanic stone, the temple is a central gathering place for the annual Yadnya Kasada ceremony. After communal prayers, worshippers make their way to the crater and throw offerings such as vegetables, fruit, flowers, money and sometimes livestock into it. Through this ritual, they give thanks for the past year and pray for protection, prosperity and good harvests.

Famous Legend: According to tradition, Yadnya Kasada originated with Roro Anteng and Joko Seger, the legendary ancestral couple of the Tengger people. Unable to have children for many years, the couple prayed to the gods at Mount Bromo and promised to sacrifice one of their children in return. They eventually had 25 children, but the youngest was destined to be sacrificed to the volcano. To this day, the legend is considered the origin of the annual offerings thrown into the crater during Yadnya Kasada.

Catching the Offerings: During Yadnya Kasada, some local people attempt to catch the offerings thrown into the crater. To do so, they climb down the steep inner slopes of the crater and wait for money, food and other gifts. The collected offerings are believed to bring good luck and are sometimes put to further use. However, climbing inside the active crater is extremely dangerous.

Protected Area: Mount Bromo lies within Bromo Tengger Semeru National Park, which covers approximately 50,276 hectares. The area was declared a national park in 1982, with its current boundaries and formal protected status established in the following years. In addition to the Tengger Caldera, the national park includes mountain forests, savannas, lakes and other volcanic landscapes. Since 2015, the national park has also formed part of the UNESCO-designated Bromo Tengger Semeru-Arjuno Biosphere Reserve. This reserve covers approximately 413,375 hectares and extends far beyond the boundaries of the national park.