What is the name of mountain range that spans eastern border califronia?

The mountain range that spans the eastern border of California is the Sierra Nevada. The Sierra Nevada is a major mountain range that runs approximately 400 miles (640 km) through eastern California, from the Klamath Mountains in the north to the Tehachapi Mountains in the south. The highest peak in the Sierra Nevada is Mount Whitney, which is also the highest mountain in the contiguous United States, at 14,505 feet (4,421 m) above sea level. The Sierra Nevada is a popular destination for outdoor recreation, including hiking, camping, fishing, and skiing.