Katchatheevu, also Kachchatheevu or Kachchativu (Tamil: கச்சத்தீவு, Sinhalese: කච්චතීවු) is an uninhabited island administered by Sri Lanka and was a disputed territory claimed by India until 1976. The island originated from a volcanic eruption that occurred in the 14th century. In 1974 India recognized Sri Lankan ownership of the island on a conditional agreement.
St. Antony's shrine is one of a kind which shares the borders of both countries India and Sri Lanka, and declared holy place by both Governments.
There stands the only religious structure, St. Antony's Catholic Shrine which holds 100+ year old traditions, and was built by an Indian Catholic (Tamilian) called Srinivasa Padaiyachi. No one is required to possess an Indian passport or Sri Lankan visa for visiting Kachchatheevu.
The church festival runs for three days. The priests from both India and Sri Lanka conduct the mass and car procession. As many as 35 country boats and 106 mechanized boats ferry the pilgrims, mostly from Rameswaram; there is not a drop of drinking water on the island, and the only structure is a beautiful church named after St. Antony, patron-saint of seafarers, to whom the feast is dedicated. It was put up by a prosperous fisherman in the early 20th century.