The name of the lake literally means "lake of the
rakshasa" in Sanskrit. It is also known as
Ravan Tal, as it is considered to be the site of the penance performed by
Ravana, the rakshasa king of
Lanka. In
Buddhism, Lake Manasarovar, which is round like the sun, and Rakshastal, shaped as a
crescent, are respectively regarded as "brightness" and "darkness". Rakshastal is a saline lake. A short, natural river named
Ganga Chhu, which connects Lake Manasarovar with Rakshastal, is traditionally believed to be created by
rishis to add pure water from Manasarovar. There are four islands in Rakshastal, named Topserma (Dose), Dola (the two biggest), Lachato (Nadzhado), and Dosharba. The islands are used by local people as winter pastures for their yaks. In the Tibetan language, the lake is known as Lagngar Cho or Lhanag Tso, which means "the dark lake of poison". ==Religious significance==