Most older giant sequoias average between 10 and 15 feet in diameter, and between 250 and 280 feet in height. Some of the most ancient trees, though, have attained heights more than 330 feet and diameters more than 35 feet. Several of the most spectacular trees have even been named. These include the "General Grant", the "Grizzly Giant", and perhaps the most massive and famous all, the "General Sherman" tree in Sequoia National Park.