Tai, great; bai, white.
The point is at the white skin of the big toe, where the white skin is widest.
Medial and proximal to the 1st metatarsophalangeal joint, at the junction of the red and white skin.
Stomachache, vomiting, diarrhea, dysentery, constipation.
Perpendicularly 0.3-0.5 cun.