Howrah or Haora is an industrial city, a municipal corporation in the Howrah district, West Bengal, India. It is the second largest city of the Indian state of West Bengal. It is the headquarters of the district, and also the headquarters of the Howrah Sadar subdivision of the district. Located on the west bank of the Hoogli River, it is a twin city to Kolkata. Howrah is the second smallest district after Kolkata. The two cities are connected by four bridges on the river Ganges, these being the Howrah Bridge, the Vidyasagar Setu, the Vivekananda Setu, the Nivedita Setu (also known as Second Vivekananda Setu and ferry services between various jetties in the two cities.Howrah Station serves as a terminal for two railway zones of India: the Eastern Railway and the South Eastern Railway. There are six other railway stations with the city, including the railway junction at Santragachhi and the terminal at Shalimar Station—all the six are part of the South Eastern Railway network. Two national highways—NH 2 and NH 6—are connected to Vidyasagar Setu via Kona Expressway. One endpoint of the Grand Trunk Road is at the Acharya Jagadish Chandra Bose Indian Botanic Garden here, where the Great Banyan tree stands. Bengal Engineering & Science University, over 150 years old, is a prestigious engineering university located in the city.