Solukhumbu District (सोलुखुम्बु जिल्ला solukhumbu, Sherpa: , Wylie: shar khum bu dzong) is one of 14 districts of Koshi Province of eastern Nepal. As the name suggests, it consists of the subregions Solu and Khumbu. The closest post office to Solukhumbu with a postal code assigned to it is the Sindhuli D.P.O., which has the postal code 56000. The district, with Salleri as its headquarters, covers an area of and had a population 107,686 in 2001 and 105,886 in 2011. Mount Everest is in the northern part of this district, within Sagarmatha National Park. Historically, Solukhumbu was part of Kirata Kingdoms in early and medieval era. It was a part of Majh Kirat Khambuwan (central province or region of Kirat Kingdoms). Before the unification of Nepal by king of Gorkha, what is now Solukhumbu district was part of Chaudandi of Majh Kirat (Khambuwan). In 1773 AD the King of Gorkha attacked and absorbed it into Nepal. The Solukhumbu district was established in 1962 carving out the old East No. 3 district. Before 1962 present Solukhumbu, Okhaldhunga and some parts of Khotang previously were one district "East No. 3". Solu and Rawa thums (counties) were carved out from East No. 3 to create Solukhumbu District. East No. 3.png|East No. 3, a district of Nepal before 1962. NepalSolukhumbuDistrictmap.png|VDCs of Solukhumbu before 2015. Solukhumbu is one of three Himalayan districts within Province No. 1, positioned on the west-by-northwestern corner of the province. It spans a total area of . It is geographically situated between latitudes 27°20'39" and 28°6'24" North, and longitudes 86°0'21" and 87°0'1" East. Its north border includes the world's highest peak (Mount Everest); and the district's lowest point is at (Tuintar) above sea level. The district is bordered by Sankhuwasabha in the east, Bhojpur in the south-east, Khotang and Okhaldhunga in the south, Bagmati Province in the west and Tibet (China) in the north. The diverse geography of Solukhumbu district is marked by three distinct levels: This region is home to the Mahalangur Himal and other Himalayan mountain ranges.