Gunung Rinjani lies within the Rinjani National Park and contains within its borders all the fascinating flora and fauna one would hope to find in a transition zone right on the Wallace Line.

Rinjani volcano on the island of Lombok 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. The volcano has been active as recently as October, 2004.

Over 20 villages surround Rinjani and there are many routes up the mountain , but the main access is from Senaru in the north and Sembalun Lawang to the east. The challenging three day Rinjani trek route from Senaru to the stunning crater rim (Plawangan), down to the stunning crater lake then on to Sembalun Lawang , is considered on of the best treks in south East Asia .Those heading for the summit usually prefer to start in Sembalun Lawang.

A model for ecotourism in Indonesia, the community based activities are focused on the Rinjani trek Center in Senaru, the most popular starting point for the tough trek. Developed with New Zealand government assistance since 1999, the Rinjani trek Center embodies under one roof (Satu atap) the unique partnership of the National park, tourism industry and Local communities that has been forged to manage and protect the Rinjani mountain environment. You can contact the Rinjani trek center at 08 681 210 4132.