The largest canyon in the world is the Grand Canyon, located in Arizona, USA. Stretching about 277 miles (446 kilometers) in length, the Grand Canyon features stunning vistas, complex geological formations, and dramatic cliffs that reach depths of over a mile. Carved over millions of years by the Colorado River, it showcases a unique tapestry of colors and rock layers that reveal Earth's geological history. The Grand Canyon is a UNESCO World Heritage Site and a popular destination for outdoor activities like hiking, rafting, and sightseeing, attracting millions of visitors each year who come to marvel at its breathtaking beauty.