Alligator reef or the Concrete Reef
Same reef different names, This reef is marked with 2 concrete piling at the North end.
2 concrete pilings at the south end.          

The reef is about 3.5 miles south of Ponce De Leon park.

For you direction impaired here are the G.P.S. numbers

26-51-505    082-05-332 north end

26-50-502    082-05-335 South end

  Here you can see the concrete markers at the end of the reef.

This is a typical day on the reef, in the distance you can see the markers on the other end.
 

From end to end 1 mile, north & south two pilings at each end.