However, in one of the previous versions of the official POTC website, the location was named the "Farthest Gate", so it is likely that "World's End" was only the waterfall that was located within the Farthest Gate.
Sometimes, conditions are so perfect that a rare double green flash can be observed. Flat prairies and deserts also tend to have the appropriate conditions for a green flash sighting. Green flash sightings frequently occur at the ocean, where more of the atmosphere is visible and the line of sight is virtually parallel to the horizon. While there isn't an optimal condition that will guarantee a green flash sighting, the best way to potentially observe one is to go somewhere that provides a clear view of the horizon and is free of pollution, such as over the ocean, according to Young. It's caused by the combination of hazy air and an unusually bright inferior, mock or subduct green flash. In this instance, a beam of green light shoots straight up a few degrees from the green flash immediately after the sun sets for about a second. The rarest type of green flash is known as a green ray.
In this rare circumstance, the upper section of the sun may appear green for up to 15 seconds. Subduct flashes are created when the sun appears to form an hourglass shape due to a phenomenon called atmospheric inversion, which occurs when a layer of warm air traps cool air and moisture close to the ground.
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