The river known for forming the **Grand Canyon** is the **Colorado River**. It plays a crucial role in eroding the layers of rock, which has created the stunningly deep and expansive canyon over millions of years. The winding river flows through the states of **Colorado**, **Utah**, **Arizona**, and **Nevada**, eventually emptying into the **Gulf of California**. The Grand Canyon is not only a significant geological feature but also a UNESCO **World Heritage Site**, attracting millions of visitors each year who marvel at its breathtaking vistas.