Hart Springs
Hart Springs is a Gilchrist County Park consisting of 3 small springs. that run out into the Suwannee.  Depths range from 7 to 20 feet in the spring basins.  A significant cave system was closed for several years after the deaths of divers.  A program called "Rescue 911" w/ William Shatner was filmed here re-enacting the deaths of 2 divers that got lost in the cave system.  The site has recently been re-opened to cave divers.  The water color tends to be  brown/green due to the vegetation around.   A boardwalk goes out to the Suwannee.  Not a visually impressive site.

Update!  Hart Springs is open to cave divers again.  You must register first. 
Visit www.hartsprings.com for more info.

Directions:
From Fanning Springs take CR 232 north. 
Turn left (west) on CR 344
and look for sign to park.