Kolkata is in a graveyard.
 Kolkata is located over the "Bengal basin", a pericratonic tertiary basin
 India's sole Chinatown is in eastern Kolkata; once home to 20,000 ethnic Chinese, its population dropped to around 2,000 as of 2009 as a result of multiple factors including repatriation and denial of Indian citizenship following the 1962 Sino-Indian War, and immigration to foreign countries for better economic opportunities

