The name Rhudaur appears to be dialect Sindarin for "Eastern Forests", and indeed Rhudaur was the most easterly of the three kingdoms in Eriador, stretching from the Weather Hills with Weathertop (Amon Sûl) to the river Bruinen (Loudwater). It shared a long border with Cardolan along the Great East Road, and with Arthedain along the line of the Weather Hills.
