Generally accepted as the largest single living organism on earth, the General Sherman tree is 30 feet thick at shoulder height, and 17 feet thick at a height of 120 feet. The first branch of the tree is more than seven feet in diameter, and the tree itself towers to a height of 275 feet. While not all giant sequoias are as famous as the General Sherman, a walk through any of the bigtree groves will make all other trees, as well as yourself, seem miniature by comparison.