Khulna is the capital city of Khulna Division in Bangladesh. On the bank of Rupsha (and Bhairav) river, it is known as the industrial city and located in south western part of Bangladesh. A large part of the Sundarbans, a UNESCO world heritage is located in Khulna.It is called the doorway city of The Sunderbans. It has many Jute mills, the only newsprint mill and hardboard mill of Bangladesh, the only state-owned match factory (Dada match, later Dhaka match), Oxygen company (BOL), Ship yard. Khulna is the third largest city in Bangladesh after Dhaka and Chittagong It is a industrial and big city inhabited by almost 2.5 million people.