This plateau is about 30 kilometres (19 mi) wide and located at an altitude of 60 to 90 metres (197 to 295 ft) above sea level. Terre de Barre is another name for this region, in use because of the reddish leached soil which is rich in iron. This southern area of Togo has been categorised by the World Wildlife Fund as part of the Guinean forest-savanna mosaic ecoregion.