It connects these two roads over the Richmond Gap in the McPherson Range.
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Formed by the confluence of the Hopping Dicks Creek and Tyalgum Creek, Oxley River rises below Mount Durigan on the southern slopes of the McPherson Range, near Tyalgum, and flows generally south by east, and then east, before reaching its confluence with the Tweed River near Murwillumbah.
In its upper reaches, Rous River is fed by a minor tributary, Hopkins Creek, on the southern slopes of the McPherson Range, south of Mount Merino; and downriver of Numinbah near the small villages of Chillingham, Jacksons Creek enters the river.