Green’s Dictionary of Slang

(N.Z.) the countryside, a remote area; usu. as away in/up in the tea-tree.

1904		N.Z. Observer 5 Mar. 4: The present writer was asked [...] to go and see the hot water away in the ti-tree somewhere [DNZE].
1966		G.W. Turner Eng. Lang. in Aus. and N.Z. 122: I know the word [i.e. woop-woops] but think of it as wook wooks [...], the sticks, the tea tree and the cactus, some semantic differentiation is not impossible.
2003		McGill Reed Dict. of N.Z. Sl.