The Yang Linking Vessel, Yangwei Mai, takes its name from a function rather than a location: "wei" is generally translated "linking" or "binding," and classical sources describe this vessel's job as tying the body's several yang channels together into one coordinated system rather than leaving them to act as separate, unconnected circuits. It travels along the outer, yang-associated aspect of the limbs and trunk up to the head, gathering the yang channels' territory into its own path as it goes.
Because it draws its route across so much of the body's yang surface, disturbances of the Yang Linking Vessel are traditionally read through exterior symptom patterns, conditions classical Chinese medicine locates at the body's surface rather than in its interior organs, particularly chills and fever, the classic signs of an external pathogenic attack still working at the yang, outer layer of the body.
Its confluent point is Triple Burner 5 on the forearm, paired with Gall Bladder 41 on the foot, and that pairing is worth noticing because it is the same pair used for the Girdle Vessel with the roles reversed: the two vessels share a set of points and are distinguished by which one is opened and which one supports. Classical description places this vessel's origin at Bladder 63 on the outside of the foot and takes it up the lateral aspect of the body to meet the Governing Vessel at the back of the neck.
Because the Governing Vessel is the great yang channel of the back, that meeting is the point at which the Yang Linking Vessel's binding function is completed rather than merely asserted.