The hills terminate in the south with the valley of the Waikato River.

[citation needed] There were at one time numerous bush railways that ran over and through the Ranges.

[2] At their highest, the Mamaku Ranges rise to over 600 metres (2,000 ft), and much of the high ground within the hills forms a plateau.

The forest includes kauri trees growing at the far southern limit of their natural range.

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