Kalaiya is a sub-metropolitan city and headquarters of Bara District in the Narayani Zone of south-eastern Nepal. Also, it lies in central development region. At the time of the 2011 Nepal Census it had a population of 123,659 residing in 28645 individual households.People often visit this place because it is the gateway to the great Gadhimai temple. And Kalaiya is famous for Sekuwa and Bhaja (chatpate). And it is the spot for some other historic importance like Simraungadh.