Final answer:
Mount Whitney is the highest point in both the contiguous United States and in California, with an elevation of 14,505 feet.
Step-by-step explanation:
The highest point in the contiguous United States and in California is Mount Whitney, which stands at an elevation of 14,505 feet (4,421 meters). Mount Whitney is located in the Sierra Nevada mountain range and it marks the boundary between Inyo and Tulare counties. Not only is it the tallest peak in California, but also the highest summit in the contiguous United States. The prominent mountain range that includes Mount Whitney is part of a line of high points in North America known as the Continental Divide, which is the line that separates the watersheds of rivers flowing eastward and westward.