What ancient stone trilithon is located in Tonga?

The ancient stone trilithon located in Tonga is Ha'amonga 'a Maui. It stands near Niutōua on Tongatapu, Tonga's main island, and is built from three enormous coral-limestone slabs: two upright stones supporting a horizontal lintel.

The monument is generally dated to around the 13th century, during the reign of Tuʻitatui, the eleventh Tuʻi Tonga. Its name means “Maui's burden,” linking it to the Polynesian hero Māui and traditions about his extraordinary strength. Historical interpretations suggest it may have served as a gateway to the royal compound at Heketa and may symbolize the bond between two royal sons.

Ha'amonga 'a Maui is sometimes nicknamed the “Stonehenge of the Pacific,” but it is not the same kind of monument as Stonehenge. A nearby stone throne, the Maka fa'akinanga, adds to the site's royal significance. Claims that the trilithon functioned as a precise sundial or astronomical calendar remain debated.