Answer:
The Central Lowlands
Step-by-step explanation:
The eastern hills are located in the Hutt Valley, part of the Wellington area on the end of the North Island of New Zealand.
The geothermal plateau is also called North Island Volcanic Plateau, and they cover the majority of the center of the North Island.
The famous geysers of New Zealand are located around The Rotorua-Taupo region on the North Island.
The only region of the listen ones that are not part of the North Island of New Zealand are the Central Lowlands. They are actually not even the region of New Zealand, as they are located in Australia.