Casuarina Beach is in Karainagar, Jaffna District, Sri Lanka, about 20 kilometers from Jaffna. The Casuarina Beach in Karainagar is also called and written as Casoorina, Cashoorina and few other variants. This is said[by whom?] to be the best beach in the Jaffna Peninsula. One can walk a long way in the deep blue water with gentle waves moving towards the land.
The beach probably got its name due the Casuarina Trees along the beach. The beach lies about 20 km off Jaffna and may take about 45 minutes to travel by a vehicle.