Tourism in West Bengal is in the South Asia region of Bengal, consisting of West Bengal and its neighbouring country of Bangladesh. It is the world's largest delta, and empties into the Bay of Bengal. It is one of the most fertile regions in the world, thus earning the nickname "The Green Delta". It stretches from the Hooghly River on the west to the Meghna River on the east. It is approximately across at the Bay of Bengal. Kolkata and Haldia are the principal Indian seaports on the delta. The Acharya Jagadish Chandra Bose Indian Botanic Garden or Calcutta Botanical Garden (previously known as
Economy of West Bengal 33% of the potato yield in 2004, despite accounting for only 7.55% of the population of India. The state's total financial debt stood at . Agriculture accounts for the largest share of the labour force. It contributed around 18.7% to the gross state domestic product (GSDP) in 2009–10. A plurality of the state's population are peasant farmers. Rice and potato are considered to be the principal food crops of West Bengal. West Bengal is the largest producer of rice in India with an annual output of around 16.1 million tonnes in FY 2015-16, and the second-largest producer of potatoes in