This park contains more than 2,000 natural arches—the utmost concentration in the country. But numbers have no significance beside the splendour of the landscape—the arches, the colossal balanced rocks, spires, pinnacle, and slick rock domes against the gargantuan sky. Perched high above the Colorado River, the park is part of southern Utah's extensive canyon country, engraved and shaped by eons of weathering and corrosion. Some 300 million years ago, inland seas covered the huge basin that shaped this region. A tiled picturesque drive takes visitors to many of the chief viewpoints within the park.