This is the gastroesophageal junction, or the location where the esophagus meets the stomach. The glistening white appearance in the foreground is the esophagus, and this is entirely normal in these patients. The esophagus meets with the stomach which is the salmon color and that also is normal. You can see that where they meet it is somewhat irregular, and it is called the Z-line. The Z-line, as you can tell from its name, is quite irregular and that is entirely normal. Often when people get heartburn, we see more irregularities of the Z-line, or we see inflammation or irritation above the Z-line in the esophagus.