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Naya Muluk (Nepali:नयाँ मुलुक) is a geographical region ofNepal, which is situated in the south-western part of Nepal. TheTerai land betweenKali River andRapti River was called "Naya Muluk" after 1860.[1][2]
After theAnglo-Nepalese War in 1814–1816, Nepal was forced to sign a treaty called theSugauli Treaty in which Nepal lost one third of its geographical territory. The geographical territory was sectioned in five parts as below:
Sections 2 and 3 (the whole land from Rapti to Gundak and Gandak to Koshi) were restored to Nepal on December 11, 1816.
Section 1 (whole low land between the RiversKali andRapti) was returned in 1860 and is calledNaya Muluk.

Naya muluk contains two districts ofSudurpashchim province and two districts ofLumbini Province. The total area is 9,207 square kilometres (3,555 sq mi) and the total population is 2144,846.
| Districts | Area (KM2) | Population |
|---|---|---|
| Kanchanpur | 1,610 | 451,248 |
| Kailali | 3,235 | 775,709 |
| Bardia | 2,025 | 426,576 |
| Banke | 2,337 | 491,313 |
... what was then called 'Naya Muluk', a strip of Terai flatlands the British had returned to Nepal in gratitude in 1860 and today encompassing the districts of Kailali, Banke, Bardiya and Kanchanpur.