What covers the superior border of the liver?

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The upper edge of the liver sits directly against the diaphragm. In life, the liver is enveloped by peritoneum, but where it contacts the diaphragm there is a region where the diaphragmatic surface and the liver are in direct apposition, with the peritoneum reflected as the coronary ligaments around this bare area. This means the structure effectively covering the superior border is the diaphragm (via its diaphragmatic peritoneal surface). The falciform ligament runs along the anterior margin, not the superior border; the coronary ligament is a peritoneal reflection that anchors the liver to the diaphragm around the bare area, rather than being the covering itself; and a general peritoneal reflection isn’t the specific covering of the border.