Punalur Bridge is the oldest bridge in Kerala built by the British. Punalur is located in Kollam district. The Punalur Suspension Bridge is the first motorable bridge in South India. The bridge is connected to four wells. The iron bars of the bridge are connected to the clips located in the wells. Each well is about 100 feet deep. The engineering behind the bridge is unknown. The bridge was built in 1877 by Albert Henry across the Kallada River.