The Boole Tree is a giant sequoia in the Giant Sequoia National Monument, Fresno County, California. The Boole Tree is the eighth tallest sequoia in the world and is the largest in terms of base circumference at 113 feet. It is estimated to be more than 2,000 years old. The tree's stature is accentuated by its isolation above the Kings River where it towers over the rest of the forest.