Rewalsar or Tso Pema in Tibetan is a small town and a pilgrimage place in a nagar panchayat in Mandi district in India. It is located in the state of Himachal Pradesh. The local name for Rewalsar is Tri Sangam. Rewalsar Lake is a tourist spot in the area.

Rewalsar Lake, also known as Tso Pema, is a mid-altitude lake located in the mountains of the Mandi district in Himachal Pradesh, India. It is located 22.5 km south-west from the town of Mandi, at an elevation of about 1,360 metres (4,460 ft) above sea level, with a shoreline of about 735 m. Rewalsar Lake is a sacred spot for Hindus, Sikhs and Buddhists, and sacred to Tibetan Buddhists for the Vajrayana practices of Padmasambhava and Mandarava, which are credited for the lake's creation.