1) The Grand Canyon, located in Arizona, United States, is a massive and awe-inspiring natural formation carved by the Colorado River. It is approximately 446 kilometers (277 miles) long, up to 29 kilometers (18 miles) wide, and reaches a depth of over 1.8 kilometers (1.1 miles).

2) The word "oxygen" contains two vowels: O and E.

3) The Great Wall of China is not visible from space without aid, contrary to popular belief.

4) The word "telephone" contains five vowels: E, E, O, E, and E.