I think this is a closeup of the Black Pool, which used to be black until 1991 when the temperature rose so high it killed the microorganisms that gave it the black color. Now it is a beautiful blue.
People were kayaking right up to the geothermal shore.
Fishing Cone is completely covered in the lake currently. Back in the 1800s before people knew any better the fisherman would catch a fish while standing near or over Fishing Cone and dip their fish in it to cook it immediately. When Fishing Cone is exposed, the water temperature reaches above boiling at 199 degrees.