Canyon Lake is one of the man-made lakes on the Salt River (Rio Salado) in the Superstition Mountains of central Arizona.  A very popular boating area, it is formed behind Mormon Flat Dam.
   Rocks visible across the lake were formed by a series of violent volcanic eruptions, which have left their record in the form of three ancient .  Little surface trace of these giant craters is left, but the outlines of them can be reconstructed by geological evidence.  If one of these were active today, it would be referred to as a "supervolcano".
   These calderas last erupted approximately 15 million years ago, during what is called the .
 
   See the GeoHistory page if you want to know more about why the landscape looks the way it does, or return to the map of "The Superstition Mountains" for more view locations.
   You can also send this as an E-Postcard to your friends!