The Great Sand Dunes National Park in Colorado is home to the tallest sand dunes in North America, reaching heights of up to 750 feet at Star Dune. Some interesting facts about Star Dune:

1. The Star Dune is the tallest dune in the park, standing at a height of 755 feet. It is also one of the tallest sand dunes in the world.

2. The shape of the Star Dune is unique, with arms radiating out from the center like a star. This shape is caused by the wind patterns in the area, which come from different directions at different times.

3. The Star Dune is constantly changing shape due to the wind. It can move up to 50 feet per year, and its arms can grow or shrink depending on the wind direction.

4. The sand that makes up the Star Dune is made of quartz and feldspar, and was brought to the area by the Rio Grande River and its tributaries.

5. The Star Dune is not the only dune in the park with a unique shape. High Dune, for example, has a distinctive crescent shape, while the dunes in the northeast section of the park have a “starburst” pattern.

6. Climbing the Star Dune is a popular activity for visitors to the park. It can be a challenging climb, however, as the sand is constantly shifting and can make footing difficult. Visitors are encouraged to wear appropriate footwear and to bring plenty of water.

7. The Great Sand Dunes National Park is also home to a variety of plant and animal species, including several that are found nowhere else in the world. Some of these include the Great Sand Dunes tiger beetle, the Piñon mouse, and the sandhill crane.

8. The park is also an important archaeological site, with evidence of human habitation dating back over 11,000 years. The Ute and Apache people were among the first to live in the area.

Another interesting natural feature is Zapata Falls, located just outside the park.