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On the lateral side of the arm, when the elbow is flexed, it is located in the depression directly above the Elbow Tip (EX-UE1), 1 cun above it. (This acupoint is paired, one on each side)

Sit with the elbow flexed. Measure 1 cun upwards from the Elbow Tip (EX-UE1) acupoint (refer to "Elbow Tip"), which is the width of one transverse finger on the thumb, and this is the location of the acupoint.