ount Rinjani or Gunung Rinjani is an active volcano in Indonesia on the island of Lombok. It rises to 3,726 m (12,224 ft), making it the third highest volcano in Indonesia. The first historical eruption occurred in September 1847. The most recent eruption of Mount Rinjani was on 1 October 2004.

The 6 km by 8.5 km oval-shaped caldera is filled partially by a crater lake known as Segara Anak ('Child of the Sea') and is approximately 2000m above sea level and estimated at being around 200m deep);the caldera also contains hot springs. The eruptions of 1994, 1995, and 1996 have formed a small cone, Gunung Baru (or 'New Mountain' - approximately 2300m above sea level) in the center of the caldera and lava flows from these eruptions have entered the lake.

The highlands are forest clad and mostly underdeveloped. The lowlands are highly cultivated. Rice, soybeans, coffee, tobacco, cotton, cinnamon, and vanilla are the major crops grown in the fertile soils of the island.

The volcano and the caldera are protected by a national park established in 1997. Tourism is increasingly popular [2] with trekkers able to visit the rim, make their way into the caldera or even to make the more arduous climb to the highest point; fatalities, however, are not uncommon.