3. VISITORS The Grand Canyon receives close to 5 million visitors each year, a far cry from the 50 thousand in had in 1919 when it became a national park
4. Colorado River A powerful and inspiring landscape, the Grand Canyon overwhelms our senses through its immense size; 277 river miles (446km) long, up to 18 miles (29km) wide, and a mile (1.6km) deep.
5. Archeological The oldest human artifacts found are nearly 12,000 years old and date to the Paleo-Indian period. There has been continuous use and occupation of the park since that time. The park has recorded over 4,800 archeological resources with an intensive survey of nearly 3% of the park area. .
