Sand Key is a coral reef located within the Florida Keys National Marine Sanctuary. It lies to the southwest of Key West within the Key West National Wildlife Refuge. This reef is within a Sanctuary Preservation Area.
The Sand Key Light was built on the key. The reef lies to the south of the light.
Wikipedia https://en.wikipedia.org/wiki/Sand_Key_(reef)
Address United States
Coordinates 24°27'25.744" N -81°52'33.02" E