Ko te toru-nui rawa te kāwanatanga i raro i te taupori kāwanatanga, ko te tata ki Uttar Pradesh ki tona hauauru, Nepal ki te raki, te wahi ki te raki o West Bengal ki te rawhiti, ki Jharkhand ki te tonga. te Bihar plain e wehea e te awa Ganges, e rere i te hauauru ki te rawhiti. e toru rohe matua converge i roto i te kāwanatanga: Magadh, Mithila, ko Bhojpur. i runga i Noema 15 2000, i tukua te tonga ki te hanga i te kāwanatanga hou o Jharkhand. anake 11.3% o te taupori o Bihar ora i roto i ngā wāhi tāone, i te mea te nui rawa i roto i Himachal Pradesh i India.
te kāwanatanga tuatoru nui rawa i runga i te taupori