What are the factors for the growth of Hugli industrial region?

Factors that contributed to the growth of Hugli industrial region are:

• Hugli industrial region development started with the opening of river port on Hugli. 
• Kolkata emerged as a leading centre of the country. 
• Later, Kolkata was connected with interior parts by railway lines and road routes. 
• Development of tea plantations in Assam and northern hills of West Bengal, the processing of indigo earlier and jute later coupled with the opening of coalfields of the Damodar Valley and iron ore deposits of the Chotanagpur plateau, contributed to the industrial development of the region. 
• Cheap labour available from the thickly populated parts of Bihar, eastern Uttar Pradesh and Odisha also contributed to its development.

Further Reading:

• Distribution of Major Industries in India
• Industrial Policy