Bidhannagar, also known as Salt Lake City is a city and a municipal corporation of North 24 Parganas district in the Indian state of West Bengal. It is a part of the area covered by Kolkata Metropolitan Development Authority. During the Salt Satyagraha, the people of Mahishbathan between present day Salt Lake and Rajarhat Newtown joined the Salt Satyagraha movement by preparing salt using indigenous methods.