wai-o-tapu, devil's bath

devil 039 bath volcanic valley waimangu lake heat water pool steam geothermal multicolored zone rotorua waiotapu hot gas bubbles orange yellow shore zealand boiling geology activity attraction colorful destination environment deposit mineral turquoise blue green landmark landscape park spring concept exotic ecological tourism wai-o-tapu devil's bath waimangu unique area rotorua place hell appears earth north island extreme