There are seven versions of the Saraswati river in this world – Suprabha, Kanchanakshi, Vishala, Manorama, Saraswati, Oghavati, Surenu. Of these, the Oghavati is said to have been invoked at Kurukshetra as per Mahabharata Shalyaparva Chapter 38. Bhishma lay on the bed of arrows beside this as per Mahabharata Shantiparva Chapter 50 verse 7.