The 2001 Indian census indicated Velankanni had a population of 10,145. Males constitute 48% of the population and females 52%. Citizens there have an average literacy rate of 69%, higher than the national average of 68%: male literacy is 75%, and female literacy is 64%. 12% of the population is under six years of age.
Velankanni has one of the country's biggest Catholic pilgrimage centres, the Basilica of Our Lady of Good Health. Devoted to Our Lady of Good Health, it is popularly known as the "Lourdes of the East". Its origins can be traced back to the 16th century. The church's founding is attributed to three miracles: the apparition of Mary and Jesus to a slumbering shepherd boy, the curing of a lame buttermilk vendor, and the survival of Portuguese sailors assaulted by a violent sea storm. It is built in the Gothic style, was modified by Portuguese and then further expanded later on due to the influx of pilgrims. The church building was raised to the status of basilica in 1962 by Pope John XXIII. Annually, 20 million pilgrims flock to the shrine from all over India and abroad, out which an estimated 3 million people visit the shrine during its annual festival from 29 August to 8 September. The 11-day annual festival concludes with the celebration of the Feast of the Nativity of Mary on 8 September.
Geography
Vailankanni is located south of Chennai and south of Nagapattinam on the Coramandel coast, at in Nagapattinam district of Tamil nadu state.
is a terminal station on the 10 kilometre long Nagapattinam - Velankanni broad gauge line. The foundation stone of the line was laid in 1999 and it was completed in 2010 at a cost of Rs. 48 crores. The line is part of the Tiruchirappalli railway division of Southern Railway zone of the Indian Railways. The Vailankanni –Chennai Egmore Link Express runs daily with only four coaches from Velankanni, which then is coupled with Kamban Express at Nagappattinam Junction for its journey towards Chennai. The weekly Velankanni Express between Vasco da Gama, Goa and Velankanni is operated bySouth Western Railway zone. Apart from the express trains, two passenger trains are also operated daily, one each to Karaikal and Nagappattinam. Special trains are operated from places like Chennai, Mumbai, Secunderabad, Bangalore, Vasco da Gama, Kollam, Ernakulam, Tirunelveli and Nagercoil during the months of August and September for the annual church feast.
2004 tsunami
Vailankanni town was among the worst hit by the massive 26 December tsunami that was triggered by the 2004 Indian Ocean earthquake. The tsunami struck at around 9.30 am on that Sunday, when pilgrims from Kerala were inside the church attending the Malayalam Mass. The water did not enter the shrine, but the receding waters swept away hundreds of pilgrims who were on the beach. The shrine's compound, nearby villages, hundreds of shops, homes and pilgrims were washed away into the sea. About 600 pilgrims died. Rescue teams extricated more than 400 bodies from the sand and rocks in the vicinity and large number of unidentified bodies were buried in mass graves.