The largest type of tree in the world is the Giant Sequoia, scientifically known as Sequoiadendron giganteum. These majestic trees are native to the western slopes of the Sierra Nevada mountains in California. Giant Sequoias can grow to be over 300 feet tall and live for thousands of years, with some ancient specimens estimated to be around 3,000 years old. Their massive trunks can surpass 30 feet in diameter, making them truly monumental. The Giant Sequoia is renowned not only for its size but also for its resilience to fire and pests, which has allowed these incredible trees to thrive in their natural environment for millennia.