Not the most imaginative name-- Off the southern Oregon coast. The island directly behind is Yellow Rock; the farther island to the right, with two summits barely visible, is Mack Arch. The small rocks to the right of it form Mack Reef. Mack Arch is supposed to be the biggest on the Oregon coast, but we're at the wrong angle here to even see the arch! The inset shows an oblique view of Arch Rock.