The Tree with the Largest Diameter in the World: El Arbol del Tule. Ahuehuete or Montezuma Cypress in Santa Maria del Tule, Oaxaca, Mexico. The trunk is 33 feet in diameter and has a circumference of 178 feet.
Araucaria araucana (Monkey puzzle tree) is an evergreen tree growing to 40 metres tall with a 2 metres trunk diameter. The tree is native to central and southern Chile, western Argentina, and southern Brazil.