The Tuesday mishap unfolded as the US commander-in-chief spoke to a crowd about conservation efforts.
"Folks, it's not hyperbole to suggest that there is no national treasure — none that is grander than the Grand Canyon," said Biden during his remarks.
"The Grand Canyon — one of the Earth's nine wonders, wonders of the world, literally. Think of that. You know, it's amazing. An enduring symbol of America to the entire world."
Not only are there seven, not nine, wonders of the world, but the Grand Canyon isn't even among them. However, the Grand Canyon is sometimes mentioned as one of the seven natural wonders of the world.
Biden designated the area a new national monument on Tuesday before signing the proclamation and touring the Grand Canyon itself. The President is expected to wrap up his trip with stops in both New Mexico and Utah.