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The Canterbury Plains cover an area bounded by the foothills of the Southern Alps and the east coast of the South Island of New Zealand. They are centred to the south of the city of Christchurch in the Canterbury region. Their northern extremes are at the foot of the Hundalee Hills in the Hurunui District, and in the south they merge into the plains of North Otago beyond the Waitaki River.
The Canterbury Plains were formed from quaternary moraine gravels deposited during glacial periods in the late pleistocene approximately 3 million years to 10,000 years ago.[1] The alluvial gravels were then reworked as shingle fans of several of the larger rivers, notably the Waimakariri, the Rakaia, the Selwyn, and the Rangitata. The land is suitable for moderately intensive livestock farming, but is prone to droughts, especially when the prevailing wind is from the northwest. At these times, the weather phenomenon known as the Nor'west arch can be seen across much of the plain.
The rivers of the Canterbury Plains have a distinctive braided appearance, which differentiates this area from the plains of North Otago to the south - beyond the Waitaki, the rivers typically have narrower, well-formed channels, rather than spreading across wide shingle depressions, as in Canterbury.
Most of the population of Canterbury lives in a series of large and small towns arranged northeast to southwest along the plains, connected by State Highway 1 and the Main South railway line. These include Christchurch, Ashburton and Timaru, and the smaller Kaiapoi, Dunsandel, Rakaia, Temuka, and Glenavy. Other town of the plains include Rangiora, Leeston, Lincoln, Darfield, Geraldine, Methven and Waimate.
References
- ^ Gage, M., (1969), 'Rocks and Landscape', in The Natural History of Canterbury, edited by Knox, G. A., Canterbury Branch of the Royal Society of New Zealand, A H & A W Reed, Wellington, page 35.
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