Western high plateau

Yankin Yammacin Kogin Yamma, Tsaunukan Yamma ko Bamenda Grassfields yanki ne na Kamaru wanda ke da babban taimako, yanayin sanyi, ruwan sama mai yawa da ciyayi na savanna. Yankin yana kan layin Kamaru kuma ya ƙunshi tsaunin tsaunuka da dutsen mai aman wuta da aka yi da lu'ulu'u da dutsen wuta. Yankin dai ya yi iyaka da yankin Filato ta Kudu da ke kudu maso gabas, da Filaton Adamawa a arewa maso gabas da kuma gabar tekun Kamaru a kudu.

 Topography da Geology 
Babban Dutsen Yamma yana kan layin Kamaru, jerin tsaunuka masu aman wuta da ke gudana daga Tekun Atlantika a kudu maso yammacin tudu zuwa Filaton Adamawa a arewa maso gabas. Yankin yana da ƙayyadaddun agaji na manyan mutane da tsaunuka. Babban Dutsen Yamma yana da tsaunuka da yawa na barci, ciki har da tsaunin Bamboutos, Dutsen Oku da Dutsen KupeGwanfogbe et al. 1983, pp. 8.. Dutsen ya tashi a matakai daga yamma. A gabas, ya ƙare a cikin tsaunuka masu tsayi daga mita 1,000 zuwa mita 2,Gwanfogbe et al. 1983, pp. 12.500, ya ƙare a cikin Kudancin Kamaru. Dutsen ya ba da damar zuwa Filaton Adamawa zuwa arewa maso gabas, wanda shi ne yanki mafi girma amma ba shi da hadariNeba 1999, pp. 17..

Tushen dutsen ya kasance da dutse mai aman wuta, wanda dutsen plutonic ke yi masa zobe Neba 1999, pp. 23–24. Tushen shine crystalline kuma dutsen metamorphic. Tushen dutsen shine farkon gneiss da granite wanda ya fara zuwa lokacin Precambrian. Layer na basalt ya rufe wannan. Vulcanism ya haifar da ƙasa mai baƙar fata da launin ruwan kasa. Zaizayar kasa ta taka rawar gani sosai.

 Yanayi da magudanar ruwa 
Filin tudu yana fuskantar yanayi na equatorial irin na Kamaru. Yankin yana fuskantar manyan yanayi guda biyu: Dogon yanayi mai tsayi na watanni tara, da gajeriyar lokacin rani na watanni uku. A lokacin damina, iska mai sanyi da damina tana tasowa daga yamma kuma ta rasa damshinsu yayin da ta afkawa tsaunukan yankin. Matsakaicin ruwan sama a kowace shekara yana daga 1,000 mm zuwa 2,000 mm. Wurare masu tsayi suna ba yankin yanayi mai sanyi fiye da sauran Kamaru. Misali, matsakaicin zafin jiki a Dschang a yankin Yamma shine 20°C.Gwanfogbe et al. 1983, pp. 17. A wajen arewa, an rage yawan ruwan sama yayin da yanayin Sudan ya fi yawa.

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