What is the oldest National Park in United States?

The oldest National Park in the United States is Yellowstone National Park. It was established on March 1, 1872, and is the first national park in the world. Yellowstone is located in the western United States, primarily in Wyoming, and also extends into Montana and Idaho. The park encompasses over 2,200,000 acres and is known for its geothermal features, including geysers, hot springs, and mud pots, as well as its abundant wildlife and beautiful landscapes.