Mount Pirongia is an extinct stratovolcano located in the Waikato region of New Zealand's North Island. It rises to 959 metres and is the highest peak in the Waikato region. It was active in the late Pliocene and early Pleistocene times. Pirongia's many peaks are basaltic cones created by successive volcanic eruptions about 2.5 million years ago. In the adjacent picture, the characteristic profile of the mountain can be seen, along with a prominent accessory cone to the right (on the northern flank). It is the tallest mountain in the Waikato.