Which of the following is a land-locked harbour?

Visakhapatnam port

The correct answer is Option (4) - Visakhapatnam port

Visakhapatnam Port in Andhra Pradesh is a land-locked harbour, connected to the sea by a channel cut through solid rock and sand. An outer harbour has been developed for handling iron-ore, petroleum and general cargo. Andhra Pradesh and Telangana are the main hinterland for this port.