Kalaiya is a municipality 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 2015 .Nepal census it had a population of 86,629 residing in 12047 individual households. People often visit this place because of the great Gadhi Mai temple. And kalaiya is famous for Sekuwa and Bhaja(chatpate). And it is the spot for some other historic importance like Simraungadh.