Kosi-Seemanchal is a subregion of Mithila region[1] in the Northeastern part of Bihar. It consists of Kosi and Purnia divisions. It has seven districts — Araria, Madhepura, Saharsa, Supaul, Purnea, Kishanganj and Katihar.[2]

Kosi-Seemanchal
Subregion
Country	India
State	Bihar
Region	Mithila
Largest city	Purnea
Divisions	Kosi and Purnia
Languages
• Spoken	Maithili (including Thēthi),Surjapuri, Hindi, Urdu, English[citation needed]
Time zone	UTC+5:30 (IST)
Major highways	NH 27, NH 31, NH 231, NH 131A, NH 131
Major Railway Lines	Barauni-Katihar, Saharsa and Purnia sections Barauni-Guwahati line

References