NH12 or Sunkoshi Corridor () or Ghurmi-Regmitar-Barkhadada road is a National Highway that runs through the Hills of Udayapur District, Bhojpur District and Khotang District of Koshi Province, Nepal. It is currently under construction. The total length of the highway is calculated to be .
The highway starts at Ghurmi (Udayapur) being separated from NH03 and runs parallel to the Sunkoshi River until Thanagaun (Tapli Rural Municipality) before it crosses the Sunkoshi river and enters into Khotang District. It then runs parallel to the Sunkoshi River again until it reaches Regmitar. The highway then crosses NH16 at Regmitar (Rajapani). The highway continues on to Damarkhu where it crosses the border of Khotang District and enters into Bhojpur District. This section of road runs in the Aamchowk Rural Municipality of Bhojpur District before it crosses the Sunkoshi River again and enters into Udayapur District again at Ranitar of the Chaudandigadhi Municipality then moves east and enters to Belaka Municipality. It finally merges with NH03 at Barkhadanda near Chatara Koshi bridge.
+ NH12 (in detail) # Section Link Section Name Length (KM) Area 1 NH12-001 Ghurmi-Thanagaun 26.21 Katari MunicipalityTapli Rural Municipality 2 NH12-002 Thanagaun-Regmitar 22.21 Halesi Tuwachung, 3 NH12-003 Regmitar-Darmarkhu 72.91 Diprung Rural MunicipalityKhotehang Rural MunicipalityJantedhunga Rural Municipality 4 NH12-004 Darmarkhu-Ranitar Bazar 12.92 Aamchowk Rural Municipality 5 NH12-005 Ranitar Bazar-Barkhadada 28.75 Chaudandigadhi MunicipalityBelaka Municipality NH12 Ghurmi-Regmitar-Barkhadada 163 Koshi Province
External links नेताहरूको पहलमा १२ वर्षपछि घुर्मी-चतरा खण्डको सडक निर्माण हुँदै सुनकोशी करिडोर सडक स्थानीय तहले निर्माण गर्ने
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