The Cambodian government under Prime Minister Hun Manet has initiated a process of “compulsory conciliation” with Thailand over a disputed maritime boundary in the Gulf of Thailand. This development comes under the mediation of the United Nations, specifically invoking the dispute resolution mechanism outlined in the United Nations Convention on the Law of the Sea (UNCLOS). The area in question is believed to be rich in natural gas, fueling both economic interest and geopolitical tensions between the two nations.
The rules under UNCLOS allow a state exclusive rights over resources in waters extending several nautical miles from its shores. However, overlapping claims are not uncommon given the complex nature of coastline geography. In this context, Thailand and Cambodia’s disagreement has historical roots, stretching back to the 1962 International Court of Justice ruling, which awarded Cambodia sovereignty over the Preah Vihear temple—a decision that has continued to influence bilateral relations.
Historically, Thailand and Cambodia have preferred direct negotiations to resolve such issues. However, tensions significantly escalated in 2025, resulting in military confrontations that led to considerable loss of life and the displacement of half a million civilians. This prompted a ceasefire agreement in December of that year. Thailand’s recent unilateral withdrawal from a 2001 Memorandum of Understanding, originally intended to provide a framework for resolving maritime disputes, has further complicated the situation and led to Cambodia’s current appeal to the UN mechanism.
Prime Minister Hun Manet defended the decision to seek UN mediation as an effort to resolve the dispute peacefully and through established international legal frameworks. The conciliation process, however, will not produce a legally binding decision but rather a report expected within 12 months, which both states are encouraged to consider seriously in their ongoing negotiations.
The incident underscores the broader challenges of maritime boundary disputes in Southeast Asia, where resource-rich waters often trigger complex diplomatic battles. The situation between Thailand and Cambodia reflects a microcosm of these broader regional dynamics, where historical grievances, economic interests, and national pride intersect. More information on this development can be found here.
As both nations navigate the conciliation process, international observers will be watching closely, noting its implications not only for Thailand and Cambodia but potentially for other regional disputes as well.