<P> Ebbing and Flowing Spring is a spring located in Hawkins County, Tennessee, near Rogersville, that is one of only two known springs in the world to exhibit tidal characteristics . </P> <P> The spring is located on land that once belonged to Colonel Thomas Amis, father - in - law of Rogersville's founder, Joseph Rogers . It is referred to as "Sinking Spring" in a land grant given to Amis by the General Assembly of North Carolina for his services during the American Revolution . Amis settled the area in around 1780 . His fort - like house is a few tenths of a mile from the spring . </P> <P> Ebbing and Flowing Spring is one of only two known springs in the world to exhibit tidal characteristics with a predictable regularity . </P> <P> During a period of 2 hours and 47 minutes, the spring's flow ranges from an indiscernible trickle to 500 US gallons (1,900 l; 420 imp gal) per minute . The water in Ebbing and Flowing Spring maintains a constant temperature of 34 ° F (1 ° C). </P>

Where are the two ebbing and flowing springs