What does the coronary ligament surround?

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The main idea is that the coronary ligaments are peritoneal reflections around the diaphragmatic (superior) surface of the liver and define the boundary of the part that is not covered by peritoneum—the bare area. The liver is almost entirely covered by peritoneum, but the bare area lies directly against the diaphragm without peritoneal covering. The coronary ligaments encircle this bare area, with their margins meeting to form the left and right triangular ligaments at the posterior edge. The falciform ligament, by contrast, connects the anterior surface of the liver to the anterior abdominal wall and does not surround the bare area. So the coronary ligaments surround the bare area of the liver.