Semeru, Active stratovolcano in East Java, Indonesia.
Semeru is an active stratovolcano on the island of Java that rises approximately 3,676 meters (12,060 feet) and regularly releases smoke from its crater. The plume rises high into the sky and remains visible across the surrounding valleys below.
The volcano formed during the Pleistocene period and has remained active for thousands of years. In December 2022, it produced an ash column that rose approximately 16 kilometers into the atmosphere.
The mountain takes its name from Semeru, a figure in Javanese mythology who holds spiritual significance for local people. Visitors often see offerings left in the mountain region, reflecting how locals show respect to this place.
Visitors need to obtain a permit from the Bromo Tengger Semeru National Park office and register with local authorities. Since conditions change rapidly due to weather and volcanic activity, hikers should check local advisories before heading up the mountain.
The crater releases steam and gas roughly every 20 minutes, allowing visitors to observe this pattern from a safe distance. This regular cycle lets hikers witness volcanic behavior in action during daylight hours.
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