English: Whakamaru Caldera approximate location and boundaries north of Lake Taupo. It must be emphasised that it has proved very challenging to define caldera boundaries in these areas prior to 25000 years ago and the various original sources show some variation of inferred and even definite boundaries, often with assignment to adjacent volcanoes as time frames of activity overlap. The more recent Maroa Caldera is contained within it and the Ohakuri Caldera which had a paired eruption with the Rotorua Caldera is to its north. To its west is the oldest Mangakino Caldera and indeed the area on the map showing separation may not be the case as these are old volcanoes of the old Taupō Rift (yellow shading). Also shown is the modern Taupo Rift (red shading), Hauraki Rift (purple shading) and landmarks of Lake Taupo and Lake Rotorua.