A coral reef is made of thin layers of calcium carbonate A coral reef is made of thin layers of calcium carbonate National Ocean Service National Oceanic and Atmospheric Administration U.S. Department of Commerce
Arches is located in northeastern Utah, near the city of Moab. The park is famous for over 2,000 natural stone arches and offers much to the outdoor traveler. There is a 40-mile paved loop tour of the park with numerous trailheads and outlooks.
Where. USA Arches National Park,Utah. The longest natural arches in the world are both in Utah, USA, which span openings of equal width. Landscape Arch, in Arches National Park, and Kolob Arch, in Zion National park, both stand over openings 94.5 m (310 ft) wide.