Base of a giant sequoia tree (Sequoiadendron giganteum) in the Mariposa Grove of Giant Sequoias located in Yosemite National Park, California, USA. This is the largest sequoia grove in Yosemite and contains over 500 mature giant sequoias. Sequoias are large and long-lived evergreen trees. They been known to reach upwards of 90 metres with trunk diameters ranging from 6?? metres. It is classified as endangered by the International Union for Conservation of Nature (IUCN) with fewer than 80,000 remaining in its native California.