Mammoth Spring, Arkansas is a charming, historical town located on the Spring River. Mammoth Spring, Arkansas's largest spring and 10th largest spring in the world, flows nine million gallons hourly.  Forming a 10-acre lake, it then flows south as the Spring River, a popular trout and float stream. Nestled in the wooded hills of the Ozark Mountains Mammoth Spring is truly a little piece of heaven!   Beautiful, clear air and four gorgeous seasons make it a wonderful place to visit or live!