Anglo-Siamese Treaty of 1909

Anglo-Siamese Treaty of 1909[1]
Bangkok Treaty
Context
  • Transfer of Kelantan, Terengganu, Kedah and Perlis to the United Kingdom of Great Britain and Ireland.
  • Britain recognised Siamese sovereignty over Patani
Signed10 March 1909
LocationBangkok
Effective9 July 1909 (1909-07-09)
Signatories
Parties
LanguageEnglish

The Anglo-Siamese Treaty of 1909 or Bangkok Treaty of 1909 was a treaty between the United Kingdom and the Kingdom of Siam signed on 10 March 1909, in Bangkok.[2][3] Ratifications were exchanged in London on 9 July 1909,[4] and the treaty established the modern Malaysia–Thailand border. The area around modern Pattani, Narathiwat, southernmost Songkhla, Satun, and Yala remained under Thai control, where decades later the South Thailand insurgency would erupt. Thailand relinquished its claims to sovereignty over Kedah (Thai: ไทรบุรี, romanizedSaiburi), Kelantan (กลันตัน, Kalantan), Perlis (ปะลิส, Palit) and Terengganu (ตรังกานู, Trangkanu) which entered the British sphere of influence as protectorates. These four states, along with Johor, later became known as the Unfederated Malay States.

  1. ^ Siam. Treaty with Great Britain Hamilton King. 13 May 1909.
  2. ^ U.S. Department of State, Bureau of Intelligence and Research, Office of the Geographer, "International Boundary Study: Malaysia - Thailand Boundary," No. 57 Archived 16 September 2006 at the Wayback Machine, 15 November 1965.
  3. ^ "Britain and Siam. Treaty signed in Siamese capital". Straits Budget. 18 March 1909. p. 22. Retrieved 5 December 2022 – via newspaperSG.
  4. ^ Great Britain, Treaty Series, No. 19 (1909)