Kolkata (formerly Calcutta) is the capital of India's West Bengal state. Founded as an East India Company trading post, it was India's capital under the British Raj from 1773–1911. Today it’s known for its grand colonial architecture, art galleries and cultural festivals. It’s also home to Mother House, headquarters of the Missionaries of Charity, founded by Mother Teresa, whose tomb is on site.
Sagar island is an island in the Ganges delta, lying on the continental shelf of Bay of Bengal about 100 km south of Kolkata.This island forms the Sagar CD Block in Kakdwip subdivision of South 24 Parganas District in the Indian State West Bengal.