Mount Whitney is the tallest mountain in California, as well as the highest summit in the contiguous United States and the Sierra Nevada—with an elevation of 4421 meters (14,505ft). It is the tallest mountain in California, as well as the highest summit in the contiguous United States and the Sierra Nevada with an elevation height of  4421 meters. The mountain is partially dome-shaped, with its famously jagged ridges extending to its outer extremities. It is in Central California on the boundary between California’s Inyo and Tulare counties.