Among the ports given in the question, Marmagao is located on estuary. Marmagao Port: It is an important port of Goa located at the entrance of Zuvari estuary and occupies fifth position in handling the traffic. Kandla Port: It is a major tidal seaport situated on the Kandla Creek, which was established in 1952. Kolkata-Haldia Port: It is the only riverine major port in India. Known for twin dock systems, viz., Kolkata Dock System (KDS) and Haldia Dock. Tuticorin Port: It is one of the major trading ports in India and is located in Tuticorin in the state of Tamil Nadu.