On this page about Rotorua Caldera:
The Rotorua Caldera is one of several large volcanoes located in the Taupo Volcanic Zone on the North Island of New Zealand. Its last major eruption was about 240,000 years ago. At this time, the Mamaku ignimbrite, covering about 4000 square km, was deposited. After the eruption, the magma chamber underneath the volcano collapsed. The circular depression left behind is the current caldera, about 16 km (10 miles) in diameter and now occupied by Lake Rotorua. Mokoia Island, close to the centre of the lake, is a rhyolite dome.
...
of geysers and hot mud pools located in the city that owe their presence to the Rotorua caldera... Rotorua Urban Area Population 55,100 Extent Ngongotaha to Owhata Territorial Authority Name Rotorua District Population 67,600 Extent Mamaku to Lake Rotoma; Tokorau to Golden Springs...
Mount Tarawera in 1886. About 140,000 years ago, the Rotorua caldera produced the most recent giant... Zealand. It is named after Lake Taupo, which is the flooded caldera of the largest volcano in the zone... known as the Rumbles and also the Kermadec Islands, with another caldera at Raoul Island. There is no...