The river has its sources in the Shropshire Hills at White Grit, located in Mid and South-west Shropshire. It has two branches, the East Onny and West Onny, which converge at Eaton, to the east of Lydham. The River Onny then flows in a south-easterly direction, through Craven Arms and Onibury , before it finally has its confluence with the River Teme just upstream of Ludlow at Bromfield. From White Grit to Bromfield, the river flows over a distance of 25 miles .
Geologically, the Onny has the type section just west of Craven Arms of the Caradocian series of the Ordovician system and there is a trilobite genus Onnia which was first defined here.
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