Semeru, also known as Muhomeru in Indonesia, stands as the highest volcano on the island of Java. Positioned at the southern extremity of the Tengger Caldera volcanic complex, Semeru boasts a crater with an active lava lake.
With an elevation of 3676 meters, Semeru claims the title of the highest point on the island. The volcano features multiple craters, with the modern crater having a diameter ranging from 500 to 650 meters and a depth reaching up to 220 meters. Comprising andesites and basalts, Semeru is a prominent attraction within the Bromo Tengger Semeru National Park.
Since 1818, Semeru has experienced 56 eruptions, maintaining continuous activity since 1967. It regularly emits plumes of smoke, volcanic ash, and pyroclastic material at intervals of 20 to 30 minutes. The primary area of eruption has shifted to the southeastern crater of the volcano.