The Cook Islands offer a natural world of extraordinary variety – from ancient volcanic peaks draped in cloud forest, to coral-rimmed lagoons teeming with tropical life. Whether above the waterline or below it, nature here is vivid, surprising and wonderfully intact.

Submerged Volcanoes and Coral Atolls

All fifteen of the Cook Islands were formed through volcanic activity. Over millions of years the geological landscape has evolved dramatically – from the low-lying coral atolls of the Northern Group, encircled by outer reefs and turquoise lagoons, to the verdant jungle-clad peaks of Rarotonga and the raised makatea coral islands of the Southern Group. Where some islands slowly sank below sea level, a coral rim remained, forming the distinctive lagoons the Northern Group is celebrated for.

The Southern Group islands account for nearly 90% of the total landmass across the entire archipelago. While Rarotonga is considered geologically young, other islands have existed for an extraordinarily long time. Mangaia, the most southerly island in the group, is widely regarded as the oldest island in the entire South Pacific.

Tropical Plants, Flowers and Birds

The Cook Islands support over 400 plant species, and are famous for their tropical flora – among them the Frangipani (Tipani), Bougainvillea (Taria), the profusely scented Gardenia (Tiare Mäori), and the resplendent orange-red Flame Tree, a native of South America. Surprisingly, very few of these colourful plants are indigenous – most were introduced over the centuries. Native species are best discovered in the mountainous interior of Rarotonga, sometimes referred to as cloud forest, where the landscape feels genuinely primeval.

The native bird population has faced significant pressures over the centuries – from the introduction of the predatory black rat and the Indian mynah bird, to the Victorian-era trade in birds and feathers. Nevertheless, remarkable species remain. Look out for the Cook Islands Fruit Dove, the Mangaia Kingfisher and the Rarotonga Flycatcher. For the best birdwatching experience in the Cook Islands, the island of Atiu is simply unmissable.

Spectacular Marine Life

Within the sheltered lagoons live tropical fish and sea life of every colour and shape – vivid-blue Starfish visible in the shallows near shore, colourful Parrot Fish, curious yellow Butterfly Fish, Moray Eels and much more, all easily admired through a snorkel mask in the warm, clear water. Beyond the reef, diverse and spectacular marine life flourishes – three species of sea turtle (Green, Hawksbill and Loggerhead) are regularly sighted, alongside Eagle Rays and Reef Sharks.

The Cook Islands are a renowned destination for divers, but perhaps the most spectacular natural event of all occurs between July and October, during the austral winter, when Humpback Whales pass close by on their seasonal migration toward the Antarctic. Witnessing these magnificent creatures in the open Pacific is an experience that stays with you long after you leave.