| Matiu / Somes Island | |
|---|---|
| Matiu (Māori) | |
 Matiu / Somes Island as seen from Mount Kaukau | |
 Location of Matiu / Somes Island within Wellington Harbour | |
| Nearest city | Wellington |
| Coordinates | 41°15′29.7″S 174°51′55.4″E / 41.258250°S 174.865389°E |
| Area | 24.9 ha (62 acres) |
| Max. elevation | 74 metres (243 ft) |
| Designation |
|
| Designated | 1995 |
| Governing body | Harbour Islands Kaitiaki Board |
Matiu / Somes Island is the largest of three islands in the northern half of Wellington Harbour, New Zealand. The island is 24.9 hectares (62 acres) in area, and lies 3 kilometres (1.9 mi) south of the suburb of Petone and the mouth of the Hutt River.
Matiu / Somes Island was used as a place of refuge by pre-colonial Māori. Middens and other remnants of habitation have been found on the island. There is also a long and varied European history. The island was used for human quarantine from 1840 until the 1920s. Ships arriving in Wellington Harbour with infectious passengers or crew would disembark them at Matiu / Somes Island for care and treatment before berthing in the city. During both World War I and World War II, "enemy aliens", including long-term residents of New Zealand who originated from enemy countries, were interned on the island. Anti-aircraft gun emplacements were also built on the island during World War II and their remains can be seen today. The island was used for animal quarantine from 1864 until 1995. A maximum security animal quarantine station was built in 1968.
The island's environment had become degraded during its long period of use for quarantine and defence purposes. However, in 1981 work began to restore the forest cover. Following more than 30 years of environmental restoration and the translocation of species, the island is now home to many native birds, invertebrates, reptiles and plants. Since 1995, Matiu / Somes Island has been designated as a scientific and historic reserve. For many years the public was banned from visiting the island due to its role as a human and animal quarantine station, but visitors are now welcome and may stay overnight on the island.
In 2009, ownership of the island was transferred to the Māori collective Taranaki Whānui ki Te Upoko o Te Ika, as part of the settlement of claims against the Crown for breaches of the Treaty of Waitangi. The island is managed by the Department of Conservation.