The waters off Mirissa between November and April host blue whales, sperm whales, and spinner dolphin pods in numbers that make this one of the world’s top marine wildlife destinations. The east coast offers a separate season (May to September) from Trincomalee, and Kalpitiya’s northwest coast delivers spinner dolphin super-pods that can number in the thousands. Darash Lanka Tours works with responsible, safety-conscious boat operators across all three sites.