Kosi-Seemanchal is in the Northeastern part of Bihar. It is a subregion within the larger cultural region of Mithila.It consists of Kosi and Purnia divisions. It has seven districts â Araria, Madhepura, Saharsa, Supaul, Purnea, Kishanganj and Katihar. Supaul, Saharsa and Madhepura in Kosi Region and Purnia, Katihar, Araria and Kishanganj in seemanchal region.
The name of the Kosi division comes from the Kosi River which flows through the region. On the other hand, Seemanchal (border area) is a colloquial alternate term for Purnia division owing to its close proximity with the BangladeshâÂÂIndia border, although the state of Bihar itself does not share any international borders with Bangladesh. The term gained popularity after the veteran RJD leader Mohammed Taslimuddin first proposed the creation of a separate Seemanchal state in 1992, during a period when he was a Member of Parliament representing Purnia on a Janata Dal ticket. The proposal included the districts of Kishanganj, Purnia, Araria, Katihar, and sometimes Bhagalpur, and Khagaria. The demand was based on SeemanchalâÂÂs distinct demography (high Muslim population) and overall socioeconomic backwardness of the region.