Zone VI
This zone is considered as semi desert and is the driest part of Kenya. Annual rainfall is 200-400 mm and is quite unreliable. The zone is found in the Marsabit, Turkana, Mandera and Wajir Districts. Dominant in this zone are Acacia and Commiphora shrubs with scattered taller trees of Delonix elata, Acacia tortilis and Adansonia digitata. Balanites eagyptica, Boscia coriacea, Salvadora persica, Acacia mellifera and Acacia reficiens are important shrubs or low tree species. The very common and important dwarf shrubs are Indigofera spinosa and Sansevieria spp. Other important shrubs are Sericocomopsis, Barberia and Duosperma eromophylum. Being the most delicate zone both annual and perennial grasses are important here. Important grasses include Aristida adoensis, Stipagrostis hirtigluma are very characteristic and may occur as annuals or perennials. Other grasses also found here are Aristida mutabilis, Chrysopogon aucheri, Tetrapogon spp, Enneapogon cenchroides, Chloris roxburghiana.

Zone VII
This is represented by the Chalbi desert in the Marsabit district. The Chalbi is a salt desert with very sparse salt bushes as the only vegetation found. It is vast and has beautiful scenery. Pastoralists use it as a source of mineral lick for livestock, particularly during the rainy season.