High Quality Content by WIKIPEDIA articles! The Waimangu Geyser, located near Rotorua in New Zealand, was the most powerful geyser in the world. ITs workings were apparently created by the great 1886 Mount Tarawera eruption, which opened an 8-3/4 mile-long fissure down the mountain and through Lake Rotomahana.THe geyser was first seen erupting in 1900. ITs eruptions were observed reaching up to 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.