Rinjani volcano on the island of Lombok (just east of Bali) rises to 3726 m, second in height among Indonesian volcanoes only to Sumatra's Kerinci volcano. Rinjani has a steep-sided conical profile when viewed from the east, but the west side of the compound volcano is truncated by the 6 x 8.5 km, oval-shaped Segara Anak caldera. The western half of the caldera contains a 230-m-deep lake whose crescentic form results from growth of the post-caldera cone Barujari at the east end of the caldera. Historical eruptions at Rinjani dating back to 1847 have been restricted to Barujari cone and consist of moderate explosive activity and occasional lava flows that have entered Segara Anak lake.
Rinjani is Indonesia's second highest volcano, and last erupted in 1995. On 3 November 1994, a cold lahar from the summit area of Rinjani Volcano traveled down the Kokok Jenggak River. Thirty people from the village of Aikmel who were collecting water from the river were killed.