Roopkund also known as mystery lake or skeleton lake is a high altitude glacial lake in the Uttarakhand state of India.

Roopkund is a popular trekking destination and it is widely famous for the hundreds of ancient human skeletons found at the edge of the lake. Mostly the human skeletal remains are visible at its bottom when the snow melts.

Initially these skeletons were found during British rule era but they were rediscovered by Nanda Devi game reserve ranger Hari Kishan Madhwal in 1942.

According to Researchers this skeletons belongs to the group of people that were killed in a sudden, violent hailstorm in the 9th century. In fact The Anthropological Survey of India has conducted a study of these skeletons and found the cause of death to be head injuries caused by round objects from above.

Yet another legend says that the King of Kanauj, Raja Jasdhaval (mostly likely a king from Gurjara Pratihara dynasty (r. 730-1036 CE) and faintly likely of Pala dynasty (r. 750-1162 CE), see ) and Rashtrakutas (r. 753-982 CE), with his pregnant wife, Rani Balampa, their servants, a dance troupe and others went on a pilgrimage to Nanda Devi shrine, and the group faced a storm with large hailstones, from which the entire party perished near Roopkund Lake.

Every year Roopkund attracts thousands of tourists but these increased tourist interaction has raised concern about the regular loss of skeletons. The district magistrate of Chamoli District has reported that tourists, trekkers, and curious researchers are transporting the skeletons on mules and recommended that the area should be protected.