A famous natıonal park Yellowstone national park is in the Rocky Mountains in the west of the United States. There are many national park in america,but this was the first one . ıt became a national park in 1872. ıt has beautiful forest,rivers, waterfalls and many kinds of wild animals. It is very famaus for its geysers. A geyser is a hot water spring. It sends up water into the air from time to time.