Cambodia and Thailand Install 39 Temporary Border Markers in Joint Survey Effort

PHNOM PENH, Cambodia (Dec.4,2025)— Cambodia and Thailand have installed 39 temporary border markers as part of a joint survey along a section of their shared frontier, officials said Wednesday.

The Secretariat of Cambodia’s Border Affairs Secretariat said the markers were placed between Border Posts 42 and 43 in O’Chrov District, Banteay Meanchey Province, opposite Thailand’s Khlong Hat District in Sa Kaeo Province. The installation took place Nov. 28 to Dec. 2.

The 39 markers are part of a planned total of 277 temporary markers for this section of the border. The joint survey team had earlier completed preliminary fieldwork.

From Nov. 19 to 26, officials from both countries conducted on-site inspections along the 7-kilometer stretch and carried out drone-based aerial photography. The imagery was jointly processed Nov. 27 to produce a photomap used to guide the marker installation.

Officials said further surveying and marker placement will continue in the coming weeks along the wider area between Border Posts 42 and 47.

Ith Sotha, permanent secretary of state at the Border Affairs Secretariat, said demarcation is conducted through bilateral negotiations and based on legally recognized documents dating back to the French colonial era.

He said temporary markers indicate where permanent posts, first installed between 1919 and 1920 by the Indochina–Siam Border Demarcation Commission, will be reinstated.

Sotha cited the 1904 and 1907 Franco-Siam treaties, the 1907 protocol, and related maps as the legal basis for the present-day boundary.