Tong Bei - 88.11

Tong Bei, also referred to as Penetrating Back, is a point on the Spleen channel that is used in conjunction with Tong Shen (88.09) and Tong Wei (88.10).

To locate Tong Wei find the Tong Shen point and measure superiorly 2 cun.

eLotus has an excellent video on how to locate and needle all three of these points.