Mount Rinjani is an active volcano that is located on the island of Lombok. Administratively, the mountain is located in the district of North Lombok. This district is one of eight districts within the province of Western Lesser Sunda Islands (Nusa Tenggara Barat).
Mount Rinjani, or as its name sounds in Indonesian - Gunung Rinjani, reaches a height of 3726 metres. It is worth noting that this active volcano ranks second in height among volcanoes in Indonesia. The summit of Gunung Rinjani is a large caldera, the size of which is 6 km by 8.5 km. The caldera differs from the crater only in size (the caldera is larger in size) and formation (the caldera is a cyrrhoidal basin, the crater is most often a funnel-shaped depression).
Inside the Gunung Rinjani caldera is a lake known as Segara Anak. In Indonesian, the name of the lake is "Anak Laut" and translates as "child of the sea" due to the fact that the water in the lake is blue in colour, like the sea (laut means "sea" in Indonesian). The lake is 2,000 metres above sea level and the lake is approximately 200 metres deep. Inside the caldera, in addition to the lake, there are geothermal springs.
For the local Sasak people, as well as for Hindus, the lake and the mountain are considered sacred. Near the mountain and on the top, near the lake, sometimes even religious rituals are performed.
Gunung Rinjani National Park is spread around the mountain, with an area of more than 60 hectares. Since 2008, the national park has been protected by UNESCO.
