The southern beaches of Sri Lanka are the most popular for tourists, the main season extending from October to April when the monsoon has moved on and the sea is calm and tranquil under bright blue skies. Bentota is one of the loveliest resorts on the coastal road, featuring good hotels, watersports and a beach at the river mouth. Divers enjoy Hikkaduwa, where there is a marine sanctuary abundant with coral and tropical fish. Close to Galle is Unawatuna with its beautiful stretch of safe sandy beach. At Kudawella a novel feature is a blowhole that throws huge columns of water into the air when ocean waves break on the rocks. The Kirinda beach just south of the town of Tissa is renowned for offering spectacular scuba diving opportunities.