Humpback whales reach Moorea after a migration of more than 6,000 kilometres from Antarctic feeding grounds, and they arrive hungry for nothing at all. They come to breed, to calve, and to sing. A Moorea Swim With Whales Tour is therefore an encounter with animals that are fasting, resting, and vocalising in some of the clearest water in the South Pacific. The island's reef shelf is narrow. Depths of 300 metres sit within a kilometre of the shore. Moorea Swim With Whales Tour tours belong to a much older maritime story. Nineteenth-century whaleships out of New England worked the Society Islands, hunting the same population now photographed rather than harpooned. The last commercial hunt in these waters is more than a century past. The Tahitian word for the humpback is tohorā; the practice known in French as la nage avec les baleines came far later. In 2002, French Polynesia declared its entire exclusive economic zone — close to five million square kilometres — a sanctuary for marine mammals. Hunting ended. Observation became the industry. Today the animals matter more than their numbers suggest. The Oceania humpback subpopulation remains small, counted in the low thousands, and is listed as endangered. Through the austral winter, mothers with newborn calves favour the sheltered water off Moorea's north coast, in the lee of ʻŌpūnohu Bay and Cook's Bay, where the swell flattens and a calf can surface without effort. Boats read the drop-off between Tiahura and Haapiti for a blow rather than chasing one; a sighting can take an hour, or ten minutes. Local associations, among them Mata Tohora, monitor approaches and record individuals by fluke pattern. Every guided swim with humpback whales in Moorea feeds photo-identification records that outlast the season. The spectacle is acoustic before it is visual. Male humpbacks hang vertically, head down, and sing for twenty minutes at a stretch; the phrases carry for kilometres through the water column and can be felt in the chest of a snorkeler at the surface. Above the waterline the vocabulary changes — breaches, pectoral slaps, the smoke-white blow that hangs for a moment over a flat sea. Visibility in the open blue routinely exceeds thirty metres, which is why the island became a reference point for in-water observation rather than deck-level Moorea whale watching. Moorea Swim With Whales Tour tour operators work with two constants: the volcanic wall of Mount Rotui behind them, and open ocean past the reef pass in front. The lagoon itself carries no entrance fee — 0 XPF — and the ocean beyond it keeps its own schedule.