Katchatheevu is a small, uninhabited island located in the Palk Strait between India and Sri Lanka. The island spans approximately 1.9 sq km (0.7 sq miles) and lies northeast of Rameswaram town in India's Tamil Nadu state and southwest of Sri Lanka's Jaffna city. When did then Prime Minister of India, Indira Gandhi, officially accept Katchatheevu as Sri Lankan territory, resolving the dispute over the island between India and Sri Lanka?