Gangasagar (Ganga Sagar) Island, is an island in the Ganges delta, lying about 100 km (54 nautical miles) south of Kolkata. This island forms the Sagar Block in Kakdwip subdivision of South 24 Parganas district in the Indian State of West Bengal. Although Sagar Island is a part of Sundarbans, it does not have any tiger habitation or mangrove forests or small river tributaries as is characteristic of the overall Sundarban delta. This island, also known as Sagardwip, is a place of Hindu pilgrimage. Every year on the day of Makar Sankranti (14 January), hundreds of thousands of Hindus gather to take a holy dip at the confluence of river Ganges and Bay of Bengal and offer prayers (puja) in the Kapil Muni Temple. The Gangasagar fair and pilgrimage is held annually on Sagar Island's southern tip, where the Ganges enters the Bay of Bengal. This confluence is also called Ganga sagar or Gangasagara. Near the confluence is the Kapil Muni Temple. The Ganga sagar pilgrimage and fair is the second largest congregation of mankind after the triennial ritual bathing of Kumbha Mela. According to reports on 14 January 2018, 18-20 lakh people had visited Ganga Sagar in 2018, against 15 lakh in 2017.