Mount Whitney or Tumanguya is a mountain in eastern California. The mountain is about 14,505 feet (4,421 m). This makes Mount Whitney the tallest mountain in the contiguous United States. Mount Whitney is only 76 miles from Badwater in Death Valley National Park, which is the lowest point in the United States. Mount Whitney is in the Sierra Nevada. Mount Whitney was named by the California Geological Survey in 1864, they named it after Josiah Whitney.