Buller District is one of 53 districts of New Zealand, and is within the West Coast Region. It covers Westport, Karamea, Reefton and Inangahua Junction.
Buller District's overall land area is 7,943.35 km (3,066.94 sq mi). The district is administered by the Buller District Council with the seat in Westport, in which 45% of the district's population live.
The West Coast (Māori: Te Tai Poutini, lit. 'The Coast of Poutini, the Taniwha') is a region of New Zealand on the west coast of the South Island. It is administered by the West Coast Regional Council, and is known co-officially as Te Tai Poutini. It comprises the territorial authorities of Buller District, Grey District and Westland District. The principal towns are Westport, Greymouth and Hokitika. The region, one of the more remote areas of the country, is also the most sparsely populated. With a population of just 32,900 people, the West Coast is the least populous region in New Zealand. The population in the region grew by 0.4% over the year to July 2023.
The region has a rich and important history. The land itself is ancient, stretching back to the Carboniferous period; this is evident by the amount of carboniferous materials naturally found there, especially coal. First settled by Kāi Tahu in approximately 1200 AD, the area was famous across New Zealand for its richness in pounamu greenstone. Kāi Tahu traded millions of modern New Zealand dollars' worth of the stone across New Zealand, making Te Tai Poutini one of the wealthiest regions in the country.
Westport (Māori: Kawatiri) is a town in the West Coast region of the South Island of New Zealand. Established in 1861, it is the oldest European settlement on the West Coast. Originally named Buller, it is on the right bank and at the mouth of the Buller River, close by the prominent headland of Cape Foulwind. It is connected via State Highway 6 with Greymouth, 100 kilometres (62 mi) to the south, and with Nelson 222 kilometres (138 mi) in the northeast, via the Buller Gorge. The population of the Westport urban area was 4,600 as of June 2025. The Buller District had a population of 10,650.
The Buller River (Māori: Kawatiri) is a river in the South Island of New Zealand. The Buller has the highest flow of any river in the country during floods, though it is only the 13th longest river; it runs for 177 km (110 mi) from Lake Rotoiti through the Buller Gorge and into the Tasman Sea near the town of Westport. A saddle at 710 m (2,330 ft) separates the Buller from the Motupiko River and that is divided from the Wairau River by a 695 m (2,280 ft) saddle, both aligned along the Alpine Fault, as is the top of the Buller valley.
Within the Buller Gorge and downstream from the Deepdale River joining, the Buller crosses from Tasman District into Buller District. The Paparoa Range separates the Buller River from the Grey River. A number of flora and fauna are found in the Buller catchment, many of these extending onto the slopes of the Paparoa Range.