What is found at the esophagus stomach junction?

Could you please clarify what specific aspect of the esophagus-stomach junction you're referring to? Is it the anatomical features, physiological functions, or potential health issues that are of interest? Generally speaking, the esophagus-stomach junction, also known as the cardia, is where the esophagus meets the stomach. It features a ring of muscle called the lower esophageal sphincter, which helps regulate the movement of food from the esophagus into the stomach. This area is also important for preventing stomach acid from refluxing back into the esophagus. Is there a specific question you have about this region?