The rest of the Tibesti Mountains consists of volcanic plateaus (tarsos in the Tedaga language), located between elevation, as well as lava fields and ejecta deposits. The plateaus are larger and more numerous in the east: the Tarso Emi Chi, the Tarso Aozi, the Tarso Ahon to the north of Emi Koussi, and the Tarso Mohi. In the center is Tarso Ourari at about . To the west, in the vicinity of Tarso Toussidé, are the small plateaus of Tarso Tôh and Tarso Tamertiou, at and , respectively. The plateaus are strewn with volcanic spires and are separated by canyons that have been formed by the irregular flow of wadis. The central part of the range is striated by a network of dry valleys with the north- and east- facing slopes silted by the prevailing winds. After the typically violent rains, these slopes form ephemeral streams and flora. The southwest slopes in the south and west of the mountain range have a gentle rise, while the northern slope of the range is a cliff overlooking the vast Libyan desert pavement known as the Sarir Tibesti.