Lake Helen and Mount Lassen, 3187 meters, in the background, Lassen Volcanic National Park, California, United States of America, North America

Lassen Volcanic National Park, California, United States of America, North America

Hellen Lake with Mount Lassen, 3187 m, in the background, Lassen Volcanic National Park, California, United States of America, North America

Lassen Volcanic National Park, California, United States of America, North America

Lassen Volcanic National Park, California, United States of America, North America

Looking south towards Lake Helen from dormant 10,457ft Lassen Peak, the world's largest plug-dome volcano, in Lassen Volcanic National Park, an area of volcanic activities and features, Lassen Volcanic Park, Northern California, California, United States of America (USA), North America

Sulphur deposits at 'Bumpass Hell', the largest area of mudpots and steam vents at this national park around Lassen Peak volcano, Lassen volcanic national park, California, Usa

Dormant 10,457ft Lassen Peak, the world's largest plug-dome volcano, in Lassen Volcanic National Park, an area of volcanic activity and features, Lassen Volcanic Park, Northern California, California, United States of America (USA), North America

Lake Helen and the dormant 10,457ft Lassen Peak, the world's largest plug-dome volcano, in Lassen Volcanic National Park, an area of volcanic activities and features, Lassen Volcanic Park, Northern California, California, USA

Manzanita Lake and the dormant 10,457ft Lassen Peak, the world's largest plug-dome volcano, in Lassen Volcanic National Park, an area of volcanic activities and features, Lassen Volcanic Park, Northern California, California, United States of America (USA), North America

Sulphur deposits at 'Bumpass Hell', the largest area of mudpots and steam vents at this national park around Lassen Peak volcano, Lassen volcanic national park, California, Usa

Lake Helen and the dormant 10,457ft Lassen Peak, the world's largest plug-dome volcano, in Lassen Volcanic National Park, an area of volcanic activities and features, Lassen Volcanic Park, Northern California, California, USA

'Cold Boiling Lake' in Lassen Volcanic National Park, Northern California, Usaan area of volcanic activities and features around Lassen Peak volcano

Fir trees in the south west of Lassen Volcanic National Park, an area of volcanic activities and features, Lassen Volcanic National Park, Northern California, California, United States of America (USA), North America

Sulphur deposits at 'Bumpass Hell', the largest area of mudpots and steam vents at this national park around Lassen Peak volcano, Lassen volcanic national park, California, Usa

Trees in a park, Lassen Volcanic National Park, California, USA

Bumpass hell sulphur area at Lassen Volcanic National Park, northern California, USA

Boardwalk through the solfatara field Bumpass Hell, Lassen Volcanic National Park, California, USA, North America