The deep offshore channel south of Mirissa is one of the most consistently productive cetacean watching locations in the world. Blue whales are regularly encountered within a few kilometres of the coast between November and April, while sperm whales are resident year-round and spinner dolphins accompany boats in acrobatic pods. The expedition departs before dawn with a licensed marine guide, and the experience of watching a blue whale surface in the open Indian Ocean is among the most extraordinary wildlife moments Sri Lanka offers.