족소양담경 (GB)   >   GB43 협계 (俠谿)
부위
발등, 넷째와 다섯째 발가락(the 4th and 5th toes) 사이, 발샅 가장자리(web margin) 몸 쪽, 赤白肉際.

On the dorsum of the foot, between the fourth and fifth toes, proximal to the web margin, at the border between the red and white flesh.
침구법
- 直刺 0.2～0.3寸
- 斜刺 0.3～0.5寸