Arboretum de Papuakeikaa, Scientific botanical garden in Ua-Huka, French Polynesia.

The Arboretum de Papuakeikaa covers 17 hectares a few kilometres east of Vaipaee, in the Manihina territorial domain on Ua Huka. It holds more than a thousand tree species from the Marquesas and elsewhere, including about 300 citrus varieties, some 270 of them on 2.5 hectares set aside in 1995. The Musée du bois jardin stands inside the grounds.

The mayor Léon Litchlé founded the arboretum in 1974, making it the oldest in French Polynesia and long the only one. It was created to counter deforestation and the loss of plant species caused by Ua Huka's dry climate and free-roaming goats, horses and pigs. The CIRAD initially supported it, later joined by the Service de Développement Rural and the commune. In 2019 volunteers cleared brush, marked trails and added benches and plant labels.

The arboretum supplies residents with tree and plant species free of charge so they can replant them on their own land, tying the garden to the island's reforestation. A fruit-processing plant in Vaipaee turns the citrus harvest into frozen purées, jams, candied fruit and chutneys, and supplies the archipelago's schools with citrus.

The site has marked trails that lead through different areas and make exploring easy. It is helpful to wear comfortable shoes and bring plenty of water, especially in warm weather.

The citrus collection occupies 2.5 hectares set aside in 1995, with more than 270 varieties; the rural development service sells a selection of 28. The Hokatu papaya grown here can produce fruits weighing over 5 kg. A fruit-processing plant in Vaipaee turns the harvest into frozen purées, jams and chutneys and supplies the archipelago's schools.