Marlborough Ecological Districts
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Marlborough has 21 ecological districts as determined by a combination of geology, vegetation, climate, and human modification. Each ecological district has distinct characteristics and organisms based on these criteria.
Wither Hills Ecological District
The Wither Hills Ecological District contains the eastern hill country between the Wairau Plain and the Awatere Valley, extending to the sea at Te Parinui o Whiti (Vernon Bluffs).
Blenheim Ecological District
The Blenheim Ecological District includes most of the Wairau plain from the western bank of the Waihopai River to Cloudy Bay in the east, with the Richmond Range and Wither Hillls bounding the district to the north and south respectively.
Fishtail Ecological District
Fishtail Ecological District is a region of greywacke and schist mountains to the north of the Wairau River, incorporating much of the Richmond Range, with extensive beech forests, in addition to exotic radiata pines.
Pelorus Ecological District
The Pelorus Ecological District includes the inland hill and mountain country of the Te Hoire/Pelorus catchment, including its tributaries, the Wakamarina, Rai, Opouri, Ronga, and Tinline Rivers.