On this day in 1919, the Grand Canyon was designated a national park. As it's "living large" week on The List and that place is huge, let's take a look at the Grand Canyon by the numbers.
-- The canyon is 277 miles long, up to 18 miles wide, and about a mile deep. It covers a total of 1,904 square miles.
-- Grand Canyon National Park gets 4.4 million visitors a year.
-- The oldest rocks in the Grand Canyon are about 2 billion years old.
-- Scientists estimate the canyon took three to six million years to form.
-- Canyon residents include about 70 species of mammals, 250 types of birds, 25 styles of reptile and five different of amphibians.
-- It's also populated by five Indian tribes.
-- In 2007, the Hualipai tribe opened the a glass-bottomed Skywalk which extends 70 feet out from the rim.
-- The Colorado River, which flows west through the canyon, averages about 300 feet wide and 100 feet deep. It flows at an average speed of four miles per hour. The river is 277 miles long.
-- Summer temperatures at the bottom of the canyon can range from 80 to 110 degrees. Winter temps range from 30 to 60.
-- There are about 1,000 caves located in the Grand Canyon, but only a few have been mapped.
It doesn't get much grander than that. That's the grand canyon by the numbers.