These arrivals are evidenced by an older road in Toi, the Ara Metua, which runs around most of Rarotonga, and is believed to be at least 1200 years old. This 29 km long, paved road is a considerable achievement of ancient engineering, possibly unsurpassed elsewhere in Polynesia.[2] The islands of Manihiki and Rakahanga trace their origins to the arrival of Toa, an outcast from Rarotonga, and Tupaeru, a high-ranking woman from the Puaikura tribe of Rarotonga. The remainder of the northern islands were probably settled by expeditions from Samoa.[3][4]