Udayapur or Udayapur District is one of the seventy five
(75) districts of Nepal. The district of Udayapur is in the state of Sagarmatha
in the Eastern Nepal. It covers an area of about 2,063 sq km with a population
of about 290,000 and Gaighat also known as Triyuga is the capital or
headquarter of Udayapur District.
Udayapur district shares its border with Sunsari, Dhankuta, Bhojpur, Khotang, Okhaldhunga, Sindhuli, Dhanusa, Siraha and Saptari districts of Nepal. Transport system is avereage in some parts of the district while other parts are work in progress and needs developing. Sagarmatha Highway is the main highway of the district which connects the district to other parts of the nation. Gaighat or Triyuga is the only municipality in the district and the other larger town in the district is a town of Katari in the western end of the district. All the government district head office of Udayapur District is located in Gaighat/Triyuga municipality.
Sunkoshi River runs on the northern border of the district which later on joins other large rivers to form Sapta Koshi, which is also the eastern border of the district.