Explanation:

Dalmianagar is one of the oldest and biggest industrial towns in India. It is situated at Dehri-on-Sone on the banks of the Son River in Rohtas district of Bihar. This is a city and a Municipality in Rohtas district in the state of Bihar, India, combinedly known as Dehri-Dalmianagar Nagar Palika.

The Industrial town of Dalmianagar was founded by the industrialist Ramkrishna Dalmia, a doyens of business in 20th century India and founder of the Dalmia Group. He was assisted by his younger brother Jaidayal Dalmia and son in law Sahu Shanti Prasad Jain in establishing many factories of Rohtas Industries Ltd. in Dalmianagar.