English: Simla Convention boundaries and actual control by ROC, 1914 - 1945

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

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• light blue line - de facto boundary during 1912-1917
• dark brown line - de facto boundary during 1918-1932
• dotted red line - de facto boundary in 1945