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.