Ardhgaya (ardhaganga) Bharmour is a pool of crystal clear water in the eastern corner of the 84 temple complex, popularly known Ardhgaya and also called with the names Ardhganga and Guptaganga.
A dip in its holy waters is considered auspicious as is corroborated by following legend. Once Shiva, Parvati and their son Ganesha were camping in Bharmour. Shiva in his leisurely moments told Parvati of the great importance of certain holy tirthas. Parvati was moved and she expressed her desire to take a dip in Falgu river of Gaya. Shiva showed his inability to grant the devi’s wish being far away from river. At this Parvati was upset and disconsolate. Realizing the gravity of situation Ganesha shot an arrow in the earth and there jutted forth water in seven springs as sacred as seven major rivers of India including Falgu of Gaya and Ganga. Parvati bathed in the water of this spring and felt gratified. Thus it is believed that a dip in the Ardhgaya pool will wash all the sins of the devotees