Sonpur hosts Asia's largest cattle fair, which starts on Kartik Poornima.

This is why many stupas and similar structures, including Pillars of Ashoka, are found on the banks of the river.

The location of Pathar Ki Mosque just opposite the confluence of the Gandaki and the Ganges shows the Muslim influence of trade and commerce in medieval times.

[citation needed] Sonpur is in the Saran District of Bihar and is easily accessible via railways, roads, and waterways.

The Bihar State Tourism Development Corporation (BSTDC) organizes ferries to Sonpur during the Sonepur Cattle Fair.

[6][7] Real estate companies were reported to be acquiring large chunks of land and dividing them into small plots.

It has its origins in ancient times: Chandragupta Maurya used to buy elephants and horses across the river Ganges.

Swiss cottages are set up by Bihar State Tourism Development Corporation (BSTDC) at the Sonpur fair,[19][20] with facilities with Internet access, motor boat rides on the Gandaki River, food at the tourist village and pre-paid taxis from Patna Airport to the cattle fair.

The English writer Harry Abbott has highlighted the importance of this temple in his diary while visiting the Hariharnath Mandir.