Which natural feature is located at 36°n, 113°w?

That point is on the Hualapai Indian Reservation in northwestern Arizona. 

The point is only about 13 miles outside the boundary of Grand Canyon
National Park, so your question is most likely fishing for "the Grand Canyon",
although it's kind of ridiculous to say that the entire Grand Canyon is all located
at one single point.

Your answer would be 625,000,000.