Sonepur is located in the Saran district in the northern part of Bihar, at the confluence of three mighty rivers Ganges and Gandak. It is a small town set in picturesque surroundings, close to Mahatma Gandhi Setu, the longest bridge in Asia. Sonepur is famous for hosting the special three-week cattle fair in the month of November. This fair is held on Karthik Purnima (the full moon day) on the banks of river Ganga. In this fair all kinds of working animals, from elephants to camels, cattle and goats, are all bought and sold. It lasts for a fortnight and the cattle are decorated for the occasion.