Lhomis of Hatia region are different from the Tibetan to the North and other adjoining areas, such as Olangchunggola and Topkegola. Answers to some of the question about the ethnicity of Lhomis raised by Haimendorf can be found in the book written by Mr.Singh. Kirati are the original inhabitants of Nepal. Dr. Baburam Acharya, the prominent Nepalese historian writes that they settled in the west, central and east Nepal in around 2nd century B.C. It has been established that Magar, Gurung in the west, Tamang in the central, Rai, Limbu and Lepcha in the east, and Tharu and other aboriginal ethnic groups in the southern plain are the descendents of the Mongol and Kirant cultural mix though in the present time only Rai and Limbu are defined as Kiranti. At the time when Tibetan king Srong-Tsen Gampo was in the height of his power a warior names Mao Rong Hang who came from Assam established his presence in Morang now known as Biratnagar. In his effort to expend his kingdom to the north he was defeated by Kiranti chiefs and he fled to Tibet probably using the route through Hatia and Kimathanka. In Tibet he established himself as head of Kampa Dzong at the behest of the Tibetan king; later he returned to the south and defeated Kiranti king with the help of Tibetans. For this mission he descended through Hatia, Topkegola and Olangchunggola.

All this happened in 7th century A.D. By 849 to 880 A.D. successive chief left their own imprint throughout east and west of Arun River. During the end of the same period a Limbu chief Shrijunga Hang (880-935 AD) said to have built fort at Chainpur and introduced Limbu script known to be one of the oldest written document, Continued migration from east to west, south to north and vice versa in the process of struggle for domination until 18th century explains unique culture of Lhomi of Hatia and other ethnic group in upper Arun River.

Late Dr.Harka Gurung, a prominent geographer explains all this in his best seller “Vignettes of Nepal.” Among the very few who visited the region are C.J. Morris and L.R.Wager. Morris  wrote "The George of Arun" and Wager wrote the book “The Arun River Pattern and the Rhine of the Himalaya” in the geographic journal.

 Trek starts at Tumlingtar and follows Arun-river towards north to Num and travel northeast to the source of Arun River, which is located beyond the old trading post of Kimathanka. The trek visits the isolated villages of Hatia, Chepuwa, Ritak and Thudam near the Tibetan border of north east Nepal. From Thudam we travel south to Topkegola. It is another village that shares the history of upper Tamur. From Topkegola, instead of taking lower trail through Mewa Khola (river) to Donje, Phapung and Lingtep the proposed trail climbs up to the ridge of Jaljala Himal (4800m) and continues the snow traverse through the high mountain trail to Milke Danda and descend to Chainpur. The traverse involve about 4 days of travel through snow and average 4700-meter elevation. Depending upon the weather and physical condition of the trekkers there is the option taking a higher trail to Milke Danda.  From Milke danda it is also possible to descend to Basantapur and catch a bus to Biratnagar. Milke Danda is famous for unique rhododendron forest. The Milke danda-Jaljala trail is one of the most spectacular anywhere. The panoramic view of four of the five tallest mountain peaks can only be seen from this trail. The long spiny mountain stretches from north to south over 25 miles. Jaljala himal has the lowest elevation in the Himalaya range.

"The trek visits the Lhomi villages near Tibetan border where Arun breaches the high Himalaya massif."