Located in Israel - the oldest known olive tree on Earth, with a tree ring age of at least 2,000 years. Carbon daters have estimated it to be about 4,000 years old. It is 15 feet thick at the base. The trunk is magnificently swirled, knotted, and bulbous. This one may be the tree Pliny the Elder (23-79 AD) wrote of when mentioning a sacred Greek olive tree 1,600 years old.