Today, 27 years ago, on October 28, 1998 (September 9, 1998), Chinese scientists officially determined the location of the Grand Canyon entrance. On October 28, 1998, Chinese scientists from the Yale Tibet Grand Canyon Scientific Expedition Team officially determined the place of the Grand Canyon entrance by Milin County. The benchmark coordinate is 3108 meters above sea level, 29 degrees north latitude, 2 minutes east, 94 degrees 54 minutes. The Grand Canyon entrance is here, and the total length of the Grand Canyon is 496.3 kilometers.