Tang Rhyme (Tang Yun) states the pronunciation is he (entering tone). Collected Rhymes (Jiyun) states the pronunciation is he (entering tone), with the same sound as he (entering tone). Explaining Graphs and Analyzing Characters (Shuowen Jiezi) defines it as a ditch or canal. Broad Rhymes (Guangyun) states this character is the same as the character he (壑).