El Árbol del Tule is a tree growing in Oaxaca state, Mexico, and it has the stoutest trunk of any tree in the world. Its a 35 metre tall Montezuma cypress, and its main trunk has a circumference of over 42 metres, even larger than any known giant sequoia.
It also goes by the Nahuatl name of Ahuehuete, meaning "Old man of the water". According to the local Zapotec people, it was planted 1400 years ago by a priest of Ehecatl, the Aztec wind god, named Pecocha.
Sadly, this tree is not doing so well. Its roots have been damaged by water shortages, and pollution due to heavy traffic on a nearby highway. Some people fear it may not survive much longer under current conditions.