# Gaua

Gaua (formerly known as Santa Maria Island) is the largest and second most populous of the Banks Islands in Torba Province in northern Vanuatu. It covers 342 km$^2$.

## Geography

Gaua is subject to frequent earthquakes and cyclones. The climate is humid tropical; the average annual rainfall exceeds 3500 mm. It has rugged terrain, reaching up to Mount Gharat (797 m), the peak of the active stratovolcano which lies at the center of the island. Its most recent eruption was in 2013. The volcano has a 6 × 9 km caldera, within which lies a crater lake, known as Lake Letas, which is the largest lake in Vanuatu. To the east of the lake is Siri Waterfall (120 m drop).

## Natural History
### Geology

Gaua's geology is fairly typical of an immature volcanic island arc. The oldest part of the island is the southwestern corner, which consists largely of primitive basalts and ankaramites. Most of the island is covered by the Santa Maria Pyroclastic Series, a mafic ignimbrite unit that was produced by the eruption that formed the caldera. Gaua is rare in hosting a mafic ignimbrite, as most similarly explosive eruptions are more silicic; other examples include Masaya in Nicaragua, and on Ambrym, and Tanna, also in Vanuatu. The eruption of the SMPS was also associated with the activation of ring faults, and the production of parasitic volcanic cones around the upper slopes of the volcano.

### Wildlife

The upper slopes of the island have been recognised as an Important Bird Area (IBA) by BirdLife International, because they support populations of Vanuatu megapodes, Vanuatu imperial pigeons, Tanna fruit doves, red-bellied fruit doves, palm lorikeets, cardinal myzomelas, fan-tailed gerygones, long-tailed trillers, streaked fantails, Melanesian flycatchers, southern shrikebills, Vanuatu white-eyes, and red-headed parrotfinches. Other animals found there include long-tailed fruit bats, Vanuatu flying foxes, and coconut crabs.

## Population and languages

In 2009, the island had a population of 2,491, and an annual growth rate of 2.0 percent. The inhabitants are scattered among various coastal villages on the western, southern and northeastern sides of the island. The eastern side has a few hamlets with an immigrant community, the members of which have come from the two smaller islands Merig and Merelava, that lie southeast of Gaua. The largest village on Gaua is Jolap, on the west coast.
In addition to Mwerlap (the language of the immigrant population), there are five languages traditionally spoken on Gaua: Lakon (also called Vuré), Olrat, Koro, Dorig, and Nume.

## Economy

The livelihood of the people of Gaua is based on the agricultural economy that is traditional throughout of Melanesia: a combination of fishing and horticulture. Their principal exports are copra and cacao.
The island is served by Gaua Airport, which is located in the northeast corner of the island.

## Names

The modern name Gaua is pronounced in Bislama, the lingua franca of Vanuatu, and in French or English.
In the local Banks languages, the island was traditionally known not by one name, but two. One name reconstructs in Proto-Torres–Banks as a form *ɣaua, the other one as *laᵑgona. These respectively referred to the northeast half of the island, and its southwestern half (where one finds Lakona Bay, and also where the Lakon language is spoken).
Thus the Mota language, which missionaries used when naming most places in the Banks Islands, has the forms Gaua and Lakona; Olrat and Lakon have Gaō and Lakon; and the immigrant language Mwerlap has Gō and Lakon. Other Torres-Banks languages that have reflexes of the two etyma include Mwotlap Agō and Alkon; and Vurës Gō and Lokon.
Some modern languages have generalized one of these two etyma to refer to the whole island. Thus it is called Gog in Nume, Gō in Koro (both < *ɣaua), and Lkon in Dorig (< *laᵑgona). Other Torres-Banks languages that have only one reflex of the two etyma include Hiw and Lo-Toga Gawe (< *ɣaua), Vera'a Lōkōno (< *laᵑgona) and Mwesen Gō (< *ɣaua).

## History

Gaua was first sighted by Europeans during the Spanish expedition of Pedro Fernández de Quirós, from 25 to 29 April 1606. The island’s name was then charted as Santa María.

## Gallery

* Mount Gharat and Lake Letas
* Siri Waterfall
* Baravit Beach (east coast)
* Local people
* Gaua as seen from space