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The Ministry of Home Affairs and the Government of Arunachal Pradesh assigned standardised names to 27 places and geographical features on Survey of India maps on 7 August 2026.
The 27 sites comprise 21 land areas and villages, 4 mountain passes, 1 high-altitude lake and 1 war memorial.
The passes named are Thag La, Dzo La, Riza La and Pukur La; the lake is Sambho Sarovar and the memorial is the Sher-e-Thapa Memorial.
The Ministry of External Affairs reaffirmed India's sovereignty over Arunachal Pradesh on the same day.
The Survey of India is the national mapping agency and the oldest scientific department of the Government of India.
The boundary between British India and Tibet is demarcated at the Simla Convention by Sir Henry McMahon, establishing the McMahon Line.
The region is administered as the North-East Frontier Agency (NEFA) under the Ministry of External Affairs.
NEFA becomes a Union Territory named Arunachal Pradesh.
Arunachal Pradesh is granted full statehood as the 24th state of the Indian Union.
Standardised names are assigned to 27 places and geographical features on Survey of India maps.
GS Paper 2 > India and its neighbourhood; GS Paper 1 > Indian geography; GS Paper 3 > Internal security in border areas
General Awareness > Indian geography and current affairs
General Knowledge > Border management and military history
General Awareness > Indian states and geography
The national mapping organisation and the oldest scientific department of the Government of India, responsible for official topographic and thematic maps.
The boundary between British India and Tibet demarcated at the 1914 Simla Convention by Sir Henry McMahon.
North-East Frontier Agency, the administrative name for the region until 1972, when it became the Union Territory of Arunachal Pradesh.
The de facto boundary between India and China, which is not a formally demarcated international boundary.