Lake Segara Anak
The walk up Mount Rinjani will take you past the scenic crater lake Segara Anak (Lake Segara). Formed in 1257, this blue lake is made up of volcanic water with hot thermal pools sitting within it. To reach the lake, you'll need to join in on one of the many hiking tours up to Mount Rinjani, with an accompanying guide.
Lake Segara sits cradled between the rugged peaks like a refreshing retreat tucked away from the elements. This crescent-shaped lake is set 600 metres below the crater rim of Mount Rinjani.
The hike up to the lake takes about two days and one night, and it will bring you past a diverse range of landscapes; from lush rainforest to rocky terrains and dare dropping cliffs. Waterfalls run directly from Segara Anak, and there are four natural hot springs within the lake. These healing properties are enough to encourage locals to climb up the mountain solely to experience these waters. While high altitude brings colder temperatures, the lake's water isn't as cold as expected. The water temperature sits at between 20 to 22 degrees Celsius, which is much higher than the mountain's average of 14 to 15 degrees. Researchers have found the warmer temperatures are linked to leaks from the magma chamber seeping into the water of Segara Anak. The water is composed of sulphate, potassium, chloride and sodium, which is then thinned by rainwater entering the lake.
Each year, the Balinese visit Segara Anak, which is considered to be a very spiritual place and a ceremony is performed. While local Wetu Telu people visit the lake every full moon and pray.