Montezuma Well is a natural sinkhole 368 feet wide, with cliffs that tower 70 feet above the water's surface. Every day 1.5 million gallons of warm water flows into the well, fed by large underwater vents, some as deep as 56 feet below the surface. The water exits the well through a cave 300 feet long, emerging into an irrigation ditch originally constructed almost 1000 years ago by the Sinagua Indians. Even today the well offers an oasis for visitors and wildlife.