Bumpass Hell Boardwalk At Lassen Volcanic National Park. Boardwalk At Bumpass Hell, Lassen Volcanic National Park, Usa. This Is The Largest Hydrothermal Area In The Park, And The Main Area Of Upflow Of Steam From Lassen Hydrothermal System

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active area attraction background blue boardwalk bumpass california cloudless day daylight discharge empty forest fumaroles geothermal green hell hot hydrothermal landmark landscape lassen mud national natural nature nobody outdoor outdoors park pine scenic sky steam summer system thermal tourism trail trailhead travel upflow usa volcanic volcano water