Sonepur Cattle Fair or Sonepur Mela is held on Kartik Poornima in the month of November in Sonepur, Bihar.
Sonepur Mela is situated on the confluence of river Ganges and Gandak.
It is also known as Harihar Kshetra Mela and it attracts visitors from all over Asia.
Sonepur Cattle Fair is the biggest cattle fair of Asia and stretches on from fifteen days to one month.
Web : http://en.wikipedia.org/wiki/Sonepur_Fair