three Lolo tribes, the descendants of Yi. Yi (or Nuosu) are still much closer to the Lisu and Myanmar languages. Myat Wai Toe observes that as the saying, "the Headwaters of the Great River, Lisu originates," where Lisu lived in "Mou-Ku-De"; they were not yet called "Lisu" until 400–200 BC. Lisu in India Lisu people in India are called Yobin. In all government records, Lisu are Yobin, and the words are sometimes used interchangeably. In Lisu is one of the minority tribes of Arunachal Pradesh of India. They live mainly in Vijoynagar Circle at Gandhigram (or Shidi in Lisu) which is the largest village. Lisus are also found in Miao town and Injan village of Kharsang Circle Changlang District. The Lisu traditionally lived in the Yunnan Province of southwestern China and in Shan State and Kachin State of northeastern Myanmar. There are about 5,000 Lisu people in India. Government discovery of Lisu On 7 May 1961, the 7th Assam Rifles expedition team led by Major Sumer Singh entered the Noa-dihing river valley and reached the largest village in the valley, Shidi (now called Gandhigram). They were accorded a warm reception by the villagers and were further told by the villagers that they were the first party to have visited the area since World War II. The Assam Rifles team assured the villagers that this virgin land was Indian territory and the people would be protected from enemy aggression. Till then the international border was not clearly demarcated. In 1972, the Demarcation of International Border with Burma was done, with the help of Lisu guides having a full knowledge of the region. During demarcation, cement International Border Pillars (IBP) were erected at regular intervals. Initially, the Indo-Burmese border had been drawn based on surveys conducted under the Topographical Survey of British India as early as 1912, following the highest ridge from the Hkakabo Razi (alt. ; the highest point in Myanmar) at the junction with the Chinese border in the north, to the Chittagong Hills in Bangladesh according to a "combination of ridges, watershed and highest crests". Later, during World War II, G.D.L. Millar's diary recalls the escape of a party of 150 European, Indian and Kachin officials and civilians fleeing the advance of the Japanese in May 1942. They went from Putao (Kachin) to Margherita (Assam) via the Chaukan Pass, and followed the valley of the Noa-dihing river. Millar records