Rosera is a city and municipality located in the Samastipur district of Bihar, India. It is situated on the banks of the Budhi Gandak River. The Rosera block encompasses a total of 48 villages.
The city serves as a connected hub with access to the rest of the country via road and railway networks. It is positioned approximately 120 km from the state capital, Patna, and is linked to the neighboring districts of Begusarai and Darbhanga via State Highways SH-55 and SH-88, respectively.