It's the largest underground freshwater supply in the world, stretching from South Dakota all the way to Texas. It's underneath most of Nebraska's farmlands, and it provides crucial water resources for farming in Colorado, Kansas, Oklahoma and even New Mexico.
It's called the Ogallala Aquifer, and it is being pumped dry.
Without the Ogallala Aquifer, America's heartland food production collapses.
No water means no irrigation for the corn, wheat, alfalfa and other crops grown across these states to feed people and animals.
And each year, the Ogallala Aquifer drops another few inches as it is literally being sucked dry by the tens of thousands of agricultural wells that tap into it across the heartland of America.