Boiling Pool at Bumpass Hell

This was recorded at Bumpass Hell in Lassen National Park, California, USA. Bumpass Hell is a hydrothermal area with fumaroles, boiling acidic pools, and bubbling mud pots. It is the largest hydrothermal area in the park, and a popular destination for park visitors. There is a boardwalk which crosses through the area and gives visitors a closer view of the many interesting features.

This recording was made on the boardwalk beside a vigorously boiling, highly acidic pool. Nearby fumaroles can be heard roaring as they emit plumes of steam and sulfurous gases. I captured this recording on a chilly morning at sunrise before any other visitors had arrived.