Mirissa is a small town on the south coast of Sri Lanka, located in the Matara District of the Southern Province. It is approximately 150 kilometres south of Colombo and is situated at an elevation of 4 metres above sea level. Mirissa's beach and nightlife make it a popular tourist destination. It is also a fishing port and one of the island's main whale and dolphin …Mirissa is a small town on the south coast of Sri Lanka, located in the Matara District of the Southern Province. It is approximately 150 kilometres south of Colombo and is situated at an elevation of 4 metres above sea level. Mirissa's beach and nightlife make it a popular tourist destination. It is also a fishing port and one of the island's main whale and dolphin watching locations.