Kosi Zone

Kosi or Koshi (, ) was one of the fourteen zones of Nepal until the restructure of zones to provinces. The headquarters of Kosi Zone was Biratnagar which was also its largest city. Other cities of Kosi Zone were Inaruwa, Dharan, Dhankutta, Jhumka, Duhabi and Itahari. Its main rivers were Arun, Tamor and Sapta Koshi.
Kosi was divided into six districts; since 2015 these districts have been redesignated as part of Province No. 1.