Its source is in the far south of Sligo, near Gorteen and Lough Gara, from which it runs for 52.3 km to its juncture with the Unshin River near Collooney to form the Ballisodare River.

The catchment is underlain by limestone, and the total length of all the rivers in the Greater Owenmore Basin Area is 639 kilometres (397 mi).

There are approximately 1,470 hectares (5.7 sq mi) of lakes in the catchment, with Lough Arrow comprising most of this.

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