Kalyan is a city situated along the Ulhas River in the Thane district of Maharashtra, India, within the Konkan division. It is under the governance of the Kalyan-Dombivli Municipal Corporation (KDMC). Kalyan serves as a subdivision (Taluka) of the Thane district and is closely linked with the township of Dombivli, together forming the Kalyan-Dombivli Municipal Corporation. The city is a founding member of the Mumbai Metropolitan Region. Kalyan ranks as the 7th largest city in Maharashtra and the 29th largest in India. Notably, it also operates as a significant railway junction, connecting trains bound for Mumbai, Karjat, and Kasara.

The historical city of Kalyan was once enclosed by a protective fort wall, which was constructed during the reign of Shah Jahan and completed under Aurangzeb’s rule in 1694 A.D. This sturdy wall extended over 2000 yards, defended by four gates and eleven towers.

For transportation, trains, buses, and auto-rickshaws play pivotal roles in and around Kalyan. Local trains are crucial, with over 200,000 residents relying on them daily.

With a population exceeding 700,000, Kalyan constitutes a key component of the Kalyan-Dombivli Municipal Corporation, which was formed in 1983. This corporation encompasses Kalyan, Dombivli, Ambernath, and 81 other villages in its administrative scope.