The Rinjani Area, Lombok
The landscape of Lombok is dominated by Mount Rinjani which covers approximately one-third of the island’s total land area and is the main water catchment area of four major watersheds, namely the Dodokan, Menanga, Putih, and Jelateng watersheds. Within this area also lies a famous lake, the Segara Anak, which with the depth of 250-300 m. is a massive water reservoir for the island. This area supplies the fresh water for Lombok’s 2, 4 millions inhabitants.
The Rinjani forest area encompasses the three districts of Lombok (West Lombok, Central Lombok, and East Lombok), and includes three different forest designations; a National Park, Protection Forest, and Limited Production Forest. The total area of Rinjani landscape is around 125,000 ha and constitutes significant forest areas for the community in Lombok, NTB province. The value of the natural resources and environmental services of the Rinjani area are estimated to exceed Rp. 5.178.158 quintillion, which includes among others Rp.386 billions/year in the agricultural sector and Rp.286 billions/year in the eco-tourism sector.
Ecologically, vegetation composition in Rinjani mountain and forest around it, has important meaning in keeping water system in Lombok, it is supported by wide area of Rinjani mountain as one of many places in West Nusa Tenggara which support wetland with its function as water absorption for its close areas , There are more than 85 water sources from Rinjani mountain with management of River Stream Area ( RSA ).
There are 10 locations of RSA and 5 sub locations of RSA. Rinjani mountain is the only water source for rivers in Lombok island that put into three water absorption , north west and east . There are about 3,000,000 inhabitants that dependent upon fresh water from this area.