Narayan Nagbali Puja (Pitra dosh) is a Vedic ritual that takes three days to complete. There are two types of this Puja: Narayan Bali Puja and the other is Nagbali puja. Both the Puja are performed for two different reasons. Narayan Bali is performed to get free from unsatisfied souls, while Nagbali Puja is performed to eliminate the sin of killing cobra or snake. Both the Puja Narayan Bali and Nagbali Puja performed at Ahilya Godavari Sangam and Sati Maha-Smashan near Trimabkeshwar Temple in Nashik, Maharashtra.
Article source: https://www.trimbakeshwar.org/hindi/narayan-nagbali