Sikhandabi

Fossilised knee cap of the Bakasura demon

The Bakasura demon lived at Sikhandabi and was terrorizing the people at Ekachakra for several years. Bakasura would eat one human being every day. The villagers had devised a system where one person from each family was sent to Bakasura every day for his meal. Mother Kunti ordered her son Bhima, who had the strength of 10,000 elephants to kill Bakasura. After a fierce fight, Bhima killed this demon.  There is a mention of this in the Srimad Bhagavatam (1.13.3-4).