Semeru volcano is the highest peak on Java, the most densely populated island in Indonesia. Photo: AP PHOTO

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.

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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.

Java is the most densely populated island in Indonesia.

The eruption throughout the

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