Kitch-iti-Kipi

No, that's not a typo.  It's the Indian name for Big Spring, a freshwater spring that gushes out of the pool bottom at 10,000 gallons a minute.  It's in Palms Book State Park, near Manistique, MI.

This raft takes people out to where the water boils up at the bottom of the pond.  It's propelled by a 4' wheel you turn by hand, takes about 10 minutes to get above the outflow location.  Trish and I were the only ones on it, the folks in this shot were the next bunch.

Looking straight down at the outflows through 40' of clear water.  The fish are trout, huge buggers.

The lighter colored areas on the bottom mark where the water flows up through the sand. 

They resemble large pots of boiling, sandy water.

Our idyllic campground at Indian Lake State Park.