The sea port of also known as the port of Cuddalore is located at the meeting the two rivers Paravanar and Gadilam. Cuddalore has been a port town since the ancient times. The ships cast their anchor about a mile away from the shore and load and discharge their cargo with the help of lighters.
A bar at the mouth of the river is used to maintain the depth of the water level, which is kept at around 6 feet at low water and around 4 feet during the monsoon months. The area around the port is rich in minerals especially lignite. There are some oil crushing mills near the sea port.