What is the longest river in New Zealand?

LEVEL: Primary / Secondary
Check out Wikipedia for more information about our longest river.

For more information about rivers in New Zealand, check out the Te Ara encyclopedia article on rivers. 
 

Hot tip: when searching for information like this, you can use google and type in most of the question, but phrase it like an answer, eg "the longest river in new zealand is".

When searching google, if you put double speech marks " " around your search term, google will search for it as a phrase.  Very handy if you're looking for something in particular and you know the words will be in that order.