Twin Sand Boils Spring is located in the littoral zone of the southern shoreline of Lake Harris near Yalaha.
Lat 28.747431° N Long. 81.804908° W
This feature consists of two small sand boils, each several inches in diameter and about a foot apart, in an area of very shallow water (less than 0.5 feet) and somewhat sparse emergent vegetation. The cool temperature of the discharge relative to the warm lake water suggests a groundwater source.
This spring was located using by aerial thermography and is documented in St. Johns River Water Management District's Special Publication SJ2008-SP7, Submerged Springs Site Documentation: August and September 2007. It was visited on September 12, 2007 by Tom Morris and Mark Long, of Karst Environmental Services, Inc. accompanied by Jeff Davis of the SJRWMD. A video of the spring is available from the SJRWMD.
This spring is undeveloped and is in Lake Harris at the shoreline.
Since the spring is in Lake Harris, access by boat should be allowed. Access via land would require permission from the land owner.