The Colorado River flows 1,450 miles to the Gulf of California and crosses seven states and two Mexican states. Here's where the mighty Colorado River starts.

The Colorado River flows 1,450 miles across North America and provides water for 40 million people. The Colorado River offers endless activities such as fishing, swimming, kayaking, and more.

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The Colorado River is the fifth-longest river in the United States and here's where the Colorado River starts and ends

The Colorado River Starts High in the Rocky Mountains

A small lake high in Rocky Mountain National Park is the Colorado River's source. From its start, the Colorado River flows 1,450 miles to the Gulf of California.

LOOK: Stunning vintage photos capture the beauty of America's national parks

Today these parks are located throughout the country in 25 states and the U.S. Virgin Islands. The land encompassing them was either purchased or donated, though much of it had been inhabited by native people for thousands of years before the founding of the United States. These areas are protected and revered as educational resources about the natural world, and as spaces for exploration.

Keep scrolling for 50 vintage photos that show the beauty of America's national parks.