This illustration is of the large rock formation that dominates the canyon below in Zion National Park, Utah. It is now better known as the Great White Throne.
The description states:
A summer trip to Zion National Park. Cedar Breaks, Bryce Canyon and the North Rim of the Grand Canyon makes an ideal outing.
–This postcard illustration was made to promote the use of the Union Pacific passenger service to the places noted on the back of the card.
This image likely dates from the 1920s, as the park was established in 1919.