Description1945 Central and Eastern Tibet from Tibetan Precis by Richardson in Himalayan Triangle.jpg
English: The map shows the frontier between the Central Tibet ('Outer Tibet') and Eastern Tibet ('Inner Tibet') as decided at the 1914 Simla Conference and the actual frontier that was in effect during various parts of the early 20th century.
From the Legend:
bold red line - frontier of the Tibet region
bold blue line - boundary between Outer Tibet and Inner Tibet proposed in the Simla Conference
dotted blue line - boundary during the Qing Empire 1727-1910
light blue line - de facto boundary during 1912-1917
dark brown line - de facto boundary during 1918-1932
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