The summit of volcano Rinjani, Gunung Rinjani, (3,726 m) is not only the highest point on Lombok, but the second highest volcano in Indonesia (Gunung Kerinci on Sumatra is the highest). Rinjani is active, and so is the smaller and newer volcano, Baru Jari, inside its crater. Beside the new smoking mini cone, the crater also contains a holy lake called Segara Anak. Both the summit of Rinjani and the crater lake are considered sacred by the local Sasak people who climb the mountain as pilgrims, but anyone is welcome to do the trek when it is considered safe. There are several routes and the treks can be done from 3 days. You can arrange guide, equipment and porters in either Senaru, Sembalun Lawang or Sapit, though Senaru seems as the most popular starting place.