Pangai is the administrative capital village of the Haʻapai Group and is located on Lifuka.
Haʻapai consists of 51 islands directly west of the Tonga Trench, constituting a chain of volcanic islands including Kao, the highest point in the kingdom standing at 1,046 metres (3,432 ft). Further to the west are the coral islands which are inhabited. The archipelago lies 204 kilometres (127 mi) north of Tongatapu and 130 kilometres (81 mi) south of Vavaʻu. Seventeen of the islands are inhabited, including the main islands of Lifuka and Foa. The two main villages in the archipelago are Pangai on Lifuka (where Salote Pilolevu Airport is located) and Ha'ano. A total of 7212 people live on the Ha'apai islands (Census 2011).
All the larger islands are in the eastern Lifuka group. The two larger islands are Lifuka and Foa which have 2,968 and 1,485 people respectively as of 2006. After the two larger islands are Nomuka and Haʻano which have four villages with a population of 951. To the south of these islands is ʻUiha, which has two villages with a population of 638, ancient burial grounds and an ancient monument.
The large islands of Tofua (active volcano) and Kao (dormant volcano) are in the far west. The islands of the Kotu group, locally known as Lulunga, are in the southwest of the archipelago. The islands of the Nomuka group, locally known as ʻOtu Muʻomuʻa, are further south.
Humpback whales migrate here in wintering seasons.
At the Haʻapai island group, traces of settlements of Lapita culture from around 1500 BC have been found.
The first European to visit Haʻapai, was Abel Tasman in 1643. Captain James Cook in 1774 and 1777, made several stops on the islands. He gave them the name of Friendly Islands in 1777.
On 18 May 1777, Cook arrived with Omai. They were greeted by Fatafehi Paulaho, 'King of the Isles' or Tu'i Tonga, the most sacred chief in these islands.
Fletcher Christian arrived on 28 April 1789, Captain William Bligh of the Bounty visited the volcanic island Tofua.
In 1806, William Mariner arrived aboard the Port-au-Prince, whose crew was killed at this occasion by Tongan warriors. Mariner lived four years in Tonga, before he was found by a passing English ship returning to England.
The US Exploring Expedition met with George (Taufa'ahua), chief of Ha'apai, in 1840.