Montezuma Well, a unit of Montezuma Castle, is located 11 miles from the Castle. Formed
long ago by the collapse of a limestone cavern, over one million gallons of water a day flows
continuously into the Well. This constant supply of warm, fresh water provides an aquatic
habitat like no other in the world, and has served as an oasis for wildlife and humans for
thousands of years.
Montezuma Well National Monument
Montezuma Well, a unit of Montezuma Castle National Monument, is a place like no other in the world. This unique
geologic feature is located 11 miles from Montezuma Castle and is home to species of animals found nowhere else on the
planet. Take your time as you wander the trails exploring pre-historic Sinaguan cliff dwellings, pueblo ruins, and a 1,000
year old irrigation ditch that still in use by local residents today!
Montezuma Well (Yavapai: Ahakaskyaywa) is a natural limestone sinkhole near Rimrock, Arizona through which some
1,400,000 gallons of water flow each day.  The water is highly carbonated and contains high levels of arsenic. At least five
endemic species live only in the Well: a diatom, a springtail, a water scorpion, an amphipod (Hyalella montezuma), and
a leech (Erpodbella montezuma) -- the most endemic species in any spring in the Southwestern United States.

Montezuma Well's outflow has been used for irrigation since the 8th century. Part of a prehistoric canal is preserved
at the picnic ground, and portions of the original Hohokam(?) canal are still in use today.   In 1968, Montezuma Well
was the subject of the first ever underwater archaeological survey to take place in a National Park, lead by archaeologist
George R Fischer.The Yavapai people believe they emerged into this world through the well, and as such, it is a very
sacred place to them.