Typically a linear sag, stream course, or meltwater conduit with a V-shaped or U-shaped cross section. Channels in the glacial environment are commonly filled with sand and gravel deposited by meltwater.
(See Meridian) Also called meridian, a network of nonanatomical conduit vessels through which the Qi circulates. Each of the Organ Networks has a corresponding channel: Liver, Gallbladder, Heart, Small Intestine, Spleen, Stomach, Lung, Large Intestine, Kidney, Bladder, Pericardium, and Triple-Burner. In addition there is the Conception Vessel, which travels along the midline in the front of the body, and the Governor Vessel, which travels along the back of the middle of the head and down the spine. There are also "extra channels," which are made up of a combination of acupuncture points from different channels.