From the Forest Service’s website:
When the Pando clone was discovered, scientists named it with a Latin word that means “I spread.” Pando is an aspen clone that originated from a single seed and spreads by sending up new shoots from the expanding root system.

Pando is believed to be the largest, most dense organism ever found at nearly 13 million pounds. The clone spreads over 106 acres, consisting of over 40,000 individual trees. The exact age of the clone and its root system is difficult to calculate, but it is estimated to have started at the end of the last ice age. Some of the trees are over 130 years old. It was first recognized by researchers in the 1970s and more recently proven by geneticists. Its massive size, weight, and prehistoric age have caused worldwide fame.

Visitors from many states, as well as other nations have travelled to central Utah to see and experience Pando, especially during the fall season when the leaves turn to yellow and orange. In 2006 the U.S. Postal Service honored the Pando Clone as one of the “40 Wonders of America” with a stamp in its commemoration.

Located at Fish Lake, Utah