Indonesia's Semeru volcano has erupted and the country's volcanology agency has increased the alert level of Java Island's tallest mountain to the highest.

The volcano spewed ash clouds as high as 2km above the mountain's peak, the agency said, adding residents should keep to a 2.5 km distance away due to risks.

Semeru, more than 3600 metres high, is one of Indonesia's 129 active volcanoes.

Terjadi erupsi G. Semeru pada hari Rabu, 19 November 2025, pukul 16:00 WIB tinggi kolom abu teramati ± 2.000 m di atas puncak. Erupsi terekam di seismograf dengan amplitudo maksimum 40 mm dan durasi 1000 detik. https://t.co/Z7jNpD8OPx via @id_magma pic.twitter.com/ItYQppcfOG— Badan Geologi (@badangeologi_) November 19, 2025

Java is the most densely populated island in Indonesia.

The eruption throug

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