Convention Between Great Britain and China Respecting Tibet
The Convention Between Great Britain and China Respecting Tibet (Chinese: 中英續訂藏印條約) was a treaty signed in Peking between the Qing dynasty and the British Empire in 1906 concerning Tibet. It was a follow-on to the 1904 Convention of Lhasa signed by the British Empire and Tibet after the British expedition to Tibet in 1903–1904.
Source: Wikipedia — Convention Between Great Britain and China Respecting Tibet (CC BY-SA 4.0)