在小腿后侧，腓肠肌两肌腹与跟腱交角处。

注：伸直小腿(跖屈)或足跟上提时，腓肠肌肌腹下出现尖角凹陷中(即腓肠肌内、外侧头分开的地方，呈“人”字形沟)。

On the posterior aspect of the leg, at the connecting point of the calcaneal tendon with the two muscle bellies of the gastrocnemius muscle.

Note: With the leg stretched (plantar flexion) or the heel up, BL57 is located at the sharp angled depression inferior to the muscle belly of the gastrocnemius muscle.

The two heads of the gastrocnemius muscle are separated to make a lambda shape (A).

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