The largest living species of tree in the world is the giant sequoia (Sequoiadendron giganteum). These majestic trees, native to the western Sierra Nevada mountains of California, can grow to be enormous, with some individuals reaching heights of over 300 feet and living for more than 3,000 years. Their thick trunks, which can measure over 30 feet in diameter, make them one of the most massive organisms on Earth. The giant sequoia is renowned for its resilience, thriving in fire-prone environments. Their sheer size and longevity inspire awe and highlight the importance of conserving these ancient trees and their ecosystems.