Unit Definition (marathon) A long distance event based on an ancient Greek event, run over a distance of just over 26 miles.
Unit Definition (ch'ih [China]) The ch'ih is a unit of distance used in China during the colonial period. The ch'ih equals 10 t'sun, 35.814 centimeters, or 14.1 inches. There are 1800 ch'ih in a li.
Length/Distance 
