The Four Seas are a category of acupoints which have a powerful effect on systems that perform specific functions in the animal’s body.
We are going to focus on the Sea of Chi acupoints. The Sea of Chi points influence the quantity and strength of the flow of chi.  When a horse is experiencing an excess of chi, they may be extremely restless or hyperactive, overly aggressive or angry, eyes bulging, or indicating that his head hurts. Indications that a horse is experiencing a chi deficiency include lethargy, shortness of breath, weakness, poor appetite, or low spirited.

The following Sea of Chi Points can be used for either Excess or Deficient Chi conditions: St 9, CV 17, GV 15, GV 14. See the chart below for locations of these acupoints.