 Smith in 1750, refers to the 'Glashigarriff' river.The Ordnance Survey name book ("c".1840) gives various versions such as 'Clashgorrave', 'Closhagorrave', 'Closhagorriff' and 'Closhagorriv', and describes the river as rising out of the bogs of Doneens and Lyroe, flowing between the parishes of Aghinagh, Aghabollogue and Magourney, and falling into the River Lee to the south.