Zhong = middle. +++
It is the Mu point of the Stomach.
It is the Hui (meeting) point of the viscera (Fu organs).
It is also the crossing point with the Small Intestine, the Triple Burner and the Stomach.
Location of Zhongwan
Zhongwan is located 4 cun above the navel.

Book - Meridians and acupuncture points
Illustrated book: 183 points