Yosemite_Valley Yosemite Valley ( yoh-SEM-it-ee) is a world-famous scenic location in the Sierra Nevada mountains of California. It is the centerpiece of Yosemite National Park, attracting visitors from all parts of the globe.The Valley is the point of entry into the park for the majority of visitors, and a bustling hub of activity during "tourist season", with an array of visitor facilities clustered in the middle.