Kolob Arch, Natural arch in Washington County, Utah, US.

Kolob Arch is a natural arch of reddish-orange sandstone in Zion National Park, Utah. Its span opens as a wide, flattened curve, with a thick left leg rising from a rounded base and the right leg descending behind trees. The underside of the span is smooth and pale orange, and the rock above the opening forms a jagged, stepped edge.

Kolob Arch is a sandstone natural arch in Zion National Park, in Washington County, Utah. The Natural Arch and Bridge Society measured its span at 287.4 ± 2 feet (87.6 m) in 2006, making it the sixth-longest natural arch in the world by that measurement, slightly shorter than Landscape Arch in Arches National Park. The society notes that different measuring techniques or definitions can change the ranking.

The name Kolob comes from the Book of Abraham in the Mormon scripture Pearl of Great Price, where Kolob is described as the star nearest to the throne of God. White settlers who brought Mormonism to the region gave the arch and the surrounding canyon and terrace the name.

Two trails reach the arch, each about seven miles (11 km) one way, for a round trip of roughly fourteen miles (23 km). A canyoneering route through Ice Box Canyon also leads there. The arch sits high above the ground, framing a cliffside, so plan a full day and carry enough water for the distance.

The Natural Arch and Bridge Society measured the span at 287.4 ± 2 feet (87.6 m) in 2006, placing it sixth among the world's longest natural arches. Different measuring techniques or definitions could shift that ranking, and the arch is reached only by trails of about seven miles (11 km) each way.