Conflicts & Resolutions · Treaty

Anglo-Siamese Treaty of 1909

1909 · 20th century · Also known as Bangkok Treaty of 1909

The Anglo-Siamese Treaty of 1909 was an agreement signed in Bangkok by which Siam transferred its claims over the northern Malay states of Kedah, Kelantan, Terengganu and Perlis to Britain. In return Britain gave up most of its extraterritorial rights in Siam and provided a loan for railway building. The treaty fixed most of the modern border between Thailand and Malaysia.

Anglo-Siamese Treaty of 1909
Image: Governments of the United Kingdom and Siam · Public domain · Wikimedia Commons

Mentioned in 6 state histories

Kedah SultanatePattani KingdomTerengganu SultanateKelantan SultanatePerlisUnfederated Malay States

See also

Cite this entry
APA
The Epoch Institute. (2026). Anglo-Siamese Treaty of 1909. In The Epoch Institute Encyclopedia. https://the-epoch-institute.org/encyclopedia/anglo-siamese-treaty-of-1909
MLA
“Anglo-Siamese Treaty of 1909.” The Epoch Institute Encyclopedia, The Epoch Institute, 2026, https://the-epoch-institute.org/encyclopedia/anglo-siamese-treaty-of-1909. Accessed .
Chicago
The Epoch Institute. “Anglo-Siamese Treaty of 1909.” The Epoch Institute Encyclopedia. 2026. https://the-epoch-institute.org/encyclopedia/anglo-siamese-treaty-of-1909.
Harvard
The Epoch Institute (2026) ‘Anglo-Siamese Treaty of 1909’, The Epoch Institute Encyclopedia. Available at: https://the-epoch-institute.org/encyclopedia/anglo-siamese-treaty-of-1909 (Accessed: ).

Last reviewed October 2026Random entry ↻