Since 1921, rulers in both India and Sri Lanka (then Ceylon) – British colonies at the time – had staked claim to fishing rights in the waters around Katchatheevu. But in 1974, India ended the dispute by relinquishing any claim over the island; two years later, India and Sri Lanka signed an agreement that prevented people from both countries from fishing in waters belonging to each other.
Source link: https://www.bbc.co.uk/news/world-asia-india-68707161