Mongla is the main sea port in the Bagerhat District of south-western Bangladesh. It was formerly located at Chalna, about 11 miles (18 km) upstream on the Pusur River, but it is now located 48 km south of Khulna city, as established in 1954. The port is situated at the confluence of the Pashur River and the Mongla River.
It lies about 62 miles (100 km) north of the Bay of Bengal and is connected to the major inland river ports and to the rail terminal at Khulna. It is very near to Sundarbans. Kolkata (formerly Calcutta) and Haldia in India and Mongla and Chittagong in Bangladesh are the principal seaports on the World's largest Ganges delta.