TheFranco-Siamese treaty of 1907 was an agreement Between theFrench Third Republic and the ThaiRattanakosin Kingdom (or Siam), in which Siam agreed to cede the territories ofInner Cambodia (includingBattambang,Siem Reap andSisophon), while France agreed to withdraw fromTrat andDan Sai. Importantly, the treaty also ended Frenchextraterritoriality over its Asian subjects in Siam, and made provisions for the demarcation of the boundary between Siam and France's colonial possessions inFrench Indochina.[1][2]
The treaty was signed in Bangkok on 23 March 1907 by French ministerVictor Collin de Plancy and PrinceDevawongse, Siam's Minister of Foreign Affairs. The treaty, which reunited the ancient Khmer capital ofAngkor with the rest of Cambodia, addressed outstanding issues remaining after the previoustreaty of 1904, in light of the international political developments following theEntente Cordiale between France and the United Kingdom.[1][2] It was the final territorial agreement between Siam and colonial France, settling the conflict that began with the1893 Franco-Siamese crisis and largely defining Thailand's modern borders with Cambodia and Laos. However, the actual demarcation of the border produced maps that deviated from the text of the treaty in certain areas—especially around theTemple of Preah Vihear—leading to theCambodian–Thai border dispute, which has continued into the 21st century.[3]