Mt. Rinjani, one of the most interesting treks in South East Asia.

Other peaks nearby are Mt. Baru, Mt Sangkareang, Mt. Buang, Mt Kondo and Mt Manuk. These mountains separated to each others by wide valleys and deep gullies with steep rock slopes. There is a lake called Segara Anak (2,008 m) on the valley Wes of Mt. Rinjani. The water smells of sulfur with temperature varies from place to place, from cold to warm and hot. An active volcano (Mt. Baru) is growing in the lake.

Gunung Rinjani National Park lies within a major bio-geographical transition zone (Wallcaeae), where the flora and fauna of South East Asia meets that of Australasia. The National Park, one of over 40 throughout Indonesia, was established in 1997. For the people of Lombok, Sasak and Balinese alike, Mt. Rinjani is revered as a sacred place and abode of deities. The crater lake is a pilgrimage destination for tens of thousand each year. Pilgrims place offering in the water and bathe away ailments in the hot springs.

For visitors, the three-day Rinjani trek route from Senaru to the crater rim, down to the Crater Lake then on to Sembalun Lawang, is considered one of the best treks in South East Asia. Trekkers that are more adventurous aim for the summit, it best reached from Sembalun Lawang returning after four days to Senaru. To assist with conservation and ensure that communities on the boundary of the National Park benefit from tourism revenues.

Revenue from tourism activities and entry fees is used for conservation, raining, management and assisting the National Park with maintenance of the Rinjani Trek, thus ensuring sustainability. Overseeing and supporting these activities is the Rinjani Trek Management Board, combining the authority of the central government (National Park) and local government (tourism office), with the voices of Lombok tourisms private sector, and the boundary communities. This institutional model is unique in Indonesia and considered an example for practical implementation of the ideals of ecotourism.