Plate boundary zones are the interaction between adjoining plates where they clash, pull separated or slide past each other.
These newly created zones can be a long stretch from few kilometers to hundreds of kilometers.
It is the movement between two plates and the distortion that come about in the boundaries of the zone between the plates, which has given birth to New Zealand's geography which we see it today.
The distortion and mashing caused by the hit of the two great plates have created mountain ranges throughout the country.