- Giant sequoia, Sequoiadendron giganteum
- 50 centimetre(s)
- United States (Sierra Nevada Mountains)
The species of tree that produces the thickest bark of all trees is the giant sequoia (Sequoiadendron giganteum). Depending upon the tree's age and trunk circumference, the bark thickness can vary between 25-121 cm (10-48 in). These trees grow indigenously in the Sierra Nevada Mountains of California, USA.