Kosi Region is a region in the Indian state of Bihar and Nepal's Sunsari District. The 4 districts in this region are Sunsari District, Saharsa District, Madhepura District and Supaul District. It consists of Kosi Division and Sunsari District. It is a subregion in Mithila.
RankTowns/ CitiesDistrictpopulation1.SaharsaSaharsa216,4912.Dharan Sunsari173,0963.ItahariSunsari198,0984.The SupaulSupaul65,437
Name The name of Kosi region comes from the Kosi River/Kausikim which flows through this region. The name Kosi comes from the ancient name Kausiki.
Administration Kosi Region has 4 districts: Supaul district Saharsa district Sunsari district Madhepura district History Kosi Region became part of Mithila in ancient times. It was ruled by the Videha in Later Vedic period, kirata and many others. Hindu scriptures and mythological texts refer this region as Matasya kshetra.
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