Kolob Arch is a natural arch located in Zion National Park in the US state of Utah. According to some methods of measurement it is the longest known natural bridge in the world, a title which it must compete with Landscape Arch to claim. Part of the problem stems from the method in which one measures the span, or length, of a natural arch. Both the methodology and technique may vary from one source to the next, and in some arches this may produce varied results. Although three different measurements of the arch all produced different lengths, the average of the results is 294 feet, edging out Landscape Arch by four feet.
Kolob Arch can only be reached via one of two hiking trails, either of which is seven miles long and results in a round trip of fourteen miles. The arch is also set close to a cliffside that it frames,
and due to this one cannot see sky through the arch from the hiking trail. This often disappoints visitors expecting to see a grand arch of red sandstone framing the blue sky, and detracts from the beauty of the world's longest such formation.
