Evolution's Own Aquarium

Lake Kutubu's fish fauna is the most extraordinary in the entire New Guinea–Australian region. Of the fourteen species found in the lake, ten or more are endemic—found only here and nowhere else. These include the Lake Kutubu rainbowfish, the strikingly patterned mogurnda species (gobies), and the unique Kutubu hardyhead. An endemic crayfish, Cherax papuanus, adds to the list of species confined to this single body of water. Scientists consider the lake's level of fish endemicity unmatched by any other lake in Oceania.↗↗↗

The lake's food chain is based on primary production within the lake itself rather than river-borne debris, an unusual trait for inland waters in Papua New Guinea. Dense beds of submerged aquatic plants provide the nursery, spawning, and feeding grounds for nine of the ten endemic fish species. This delicate ecological balance is why the site was recognized under the Ramsar Convention in 1998.↗

Birds of Paradise and Pristine Rainforest

The forests ringing Lake Kutubu and the broader Kikori Basin harbor a staggering 252 bird species recorded across survey sites. Of the 31 species of Bird of Paradise known from Papua New Guinea, six are resident in the Kutubu region specifically, and 24 inhabit the wider Kikori River Basin. WWF-PNG, working with local landowner groups, is developing guided bird-watching trails around the lake—a partnership that aims to make conservation economically rewarding for the communities who live here.↗

Beyond birds, the Kikori Basin is home to the world's longest lizard, the largest egg-laying mammal (the echidna), the largest pigeon, the largest moth, and the second-largest butterfly. Lowland moist tropical rainforest, such as that surrounding Lake Kutubu, contains more species of plant, animal, and insect than any other habitat type on Earth.↗

Living Culture: The Foe and the Kutubu People

The lake catchment is home to two main ethnic groups: the Foe to the south and the Fasu to the north, together totaling about 10,885 people across 33 villages. The Foe include the Gurubumena—the 'lake people'—who depend on the lake's fish and surrounding sago forests for sustenance. Their traditional hausman (long houses for men) are reportedly among the longest thatched structures in the world, built on ridges and reserved exclusively for males under customary law.↗

The men of Kutubu are renowned for producing digaso oil from the karoh tree—a prized trade good historically exchanged with the Huli for pigs, with the Nipa for stone axes, and with the Lake Sirunki people for salt. Face painting in red, yellow, and black oils remains a distinctive cultural marker of the Foe, with each color signifying a different stage of life or status.↗

The annual Kutubu Kundu & Digaso Festival, held in September around Daga village, is the region's premier cultural gathering. Recognized by PNG's Tourism Promotion Authority, it showcases traditional sing-sing performances, music, dance, storytelling, and customary crafts from communities across the Kikori River Basin and Great Papuan Plateau. The 2026 edition is scheduled for 23–26 September with the theme 'Raising the Haus Man: Foundations of Our Identity.'↗↗

What to Do at the Lake

Fishing is the lake's daily livelihood and a genuine visitor experience—try your luck with local guides using traditional methods in waters that hold species found nowhere else. The clear conditions make for rewarding catches and beautiful views of the underwater plant beds from your canoe.↗↗

Bird watching around established forest trails offers encounters with six resident species of Bird of Paradise and hundreds of other birds in their natural habitat. Forest trekking through the surrounding primary rainforest may reveal tree kangaroos and rare orchids. The Tugiri Orchid Garden nearby showcases species endemic to Papua New Guinea, and a local butterfly farm includes the world's second-largest butterfly species.↗↗

For the adventurous, the trek to Wasi (Beaver) Falls leads to one of Papua New Guinea's largest waterfalls, plunging over 100 meters into a basin where ancient burial caves are found. The route weaves through pristine rainforest teeming with birds and wildlife. Cultural sites such as the Bebere and Kosama skull caves—traditional burial grounds where customary rites are still observed—offer a sobering window into ancestral traditions.↗

A day spent observing the traditional sago-making process—where palm pith is beaten, washed, and formed into the starchy staple that feeds the community—is one of the most immersive cultural encounters available in the highlands.↗↗

Getting There and Practical Advice

Lake Kutubu lies about 35 to 50 kilometers southwest of Mendi, the Southern Highlands provincial capital. The drive from Mendi to the lake takes approximately five to six hours along rough roads that have improved somewhat since oil and gas development brought infrastructure to the region. A more direct option is flying into Moro Airport in Southern Highlands Province, which has scheduled domestic services from Port Moresby.↗↗↗↗

Accommodation options include Tubo Lodge, located on an island in the middle of Lake Kutubu—one of the most spectacular settings in all of Papua New Guinea. For visitors attending the festival, basic lodging is available near the Pimaga government station area. Given the remoteness, arranging transport and accommodation through a tour operator is strongly recommended.↗↗

Rainfall is distributed throughout the year but is heaviest in August, September, and October, with annual totals around 4,500 mm. Average temperatures hover at 23°C. Pack for humid lowland conditions with rainforest terrain—this is a world apart from the cooler central highlands valleys. Water levels in the lake can fluctuate by about two meters between wet and dry seasons, affecting shoreline access.↗