The Waimangu Geyser was the most powerful geyser in the world. Its workings were apparently created by the great 1886 Mount Tarawera eruption, which opened a 14 km-long (8.75 miles) fissure down the mountain, through Lake Rotomahana and the Waimangu Volcanic Rift Valley.

The geyser was first seen erupting in 1900. Its eruptions were observed reaching up to 460 metres (1,500 ft) in height, and it excited worldwide interest. As a result of a landslide which changed the water table, the geyser became extinct on November 1, 1904.

The water expelled by the geyser was black with rocks and mud from the surrounding terrain, so the indigenous M?ori people named the geyser Waimangu, meaning ‘Black Waters’. The geyser gave its name to the surrounding geothermal region, the Waimangu Volcanic Rift Valley.

On August 31, 1903, David McNaughton, Joseph Warbrick, and sisters Ruby and Catherine Nicholls were killed after ignoring requests from Warbrick’s brother Alfred to return to a safe distance, after venturing close to the edge of the geyser. The four were swept away in a sudden violent eruption.

FROM:
Waimangu scenic reserve’, URL: http://www.nzhistory.net.nz/media/photo/waimangu, (Ministry for Culture and Heritage), updated 15-Jul-2013