This is one of the hot ponds along the walking trail, where from time to time a burst of hot water indicates the underground boiling.
I enjoy photographing the bursts of water, but after the sulfurous air got into my nose, I felt that smell the whole day long...
EXIF info:
Nikon D300
Lens: 18-70mm F/3.5-4.5G
Focal Length: 18mm
Aperture: F/6.3
Shutter Speed: 1/100s
ISO Sensitivity: ISO 320