Zion Canyon presents a diverse collection of nature's wonders that include such features as the towering and magnificent 2,200-foot Great White Throne, the park's most famous landmark; the Court of the Patriarchs; the Sentinel; the Watchman; Checkerboard Mesa; Kolob Arch, at 310 feet the world's largest known natural span; and the Narrows of the Virgin River, where a person can walk upstream to places so narrow that both sides of the canyon walls can almost be touched with one's outstretched hands.