The General Sherman Tree, inside of the Giant Forest in Sequoia National Park, is the World's Largest Tree. Estimated to be an age of 2,300-2,700 years old, it is also one of the longest lived trees on Earth. This Gigantic Sequoia Tree is 274.9 feet tall with a ground circumference of 102.6 feet. The diameter of its largest branch measures 6.8 feet. It is certainly one of the great wonders of the Sierra Nevada Mountains.