Currently, there are only two places on planet earth where moonbows can be seen on a consistent basis: Victoria Falls on the Zambia-Zimbabwe border and Cumberland Falls near Corbin, Kentucky.
Where are Moonbows most common?
There are some locations around the world where moonbows occur more frequently. Most of these locations tend to have waterfalls, which create layers of mist in the air. Some of these locations include Yosemite National Park in California and Cumberland Falls State Resort Park in Kentucky.
Why do Moonbows occur?
A moonbow (sometimes known as a lunar rainbow) is an optical phenomenon caused when the light from the moon is refracted through water droplets in the air. The amount of light available even from the brightest full moon is far less than that produced by the sun so moonbows are incredibly faint and very rarely seen.