Moonan BrookMoonan Brook, a mostly perennial stream of the Hunter [River |Hunter River] catchment, is located in the Hunter region of New [South Wales], Australia.CourseOfficially designated as a river, the Moonan Brook rises below Mount Barrington on the western slopes of Mount [Royal Range]. The river flows generally west northwest before reaching its confluence with the Hunter River near the locality of Moonan Flat, east of. Moonan Brook descends over its course.