The Real Stakes in Thailand and Cambodia’s Maritime Dispute
The Thailand Ministry of Foreign Affairs and Cambodia’s Foreign Ministry have traded sharp words over the 2001 maritime memorandum of understanding (MOU), but the true battle isn’t over lines on a map — it’s over who controls the resources beneath the Gulf of Thailand. With conciliation proceedings now underway in Singapore, the outcome will shape how gas revenues are managed — and who ultimately benefits in coastal communities like Trat and Chanthaburi.
Why This Matters
• Resource control: Any future agreement on joint development would need to navigate complex legal frameworks, including Thailand’s domestic energy laws, which govern how revenue from offshore resources is collected and distributed.
• Koh Kood is non-negotiable: Thailand’s sovereignty over Koh Kood is rooted in the 1907 Franco-Siamese Treaty, a historical agreement that remains central to its position. International bodies under UNCLOS cannot revise this sovereignty, making the island’s status a firm boundary in negotiations.
• Timeline uncertainty: The one-year conciliation window established under UNCLOS Annex V may extend beyond its deadline due to procedural delays and the complexity of bilateral relations. Neither side has signaled urgency to finalize a resolution.
The disputed zone, spanning approximately 26,000 square kilometers, is believed to hold significant natural gas reserves, though exact figures remain unverified by joint surveys. Neither government has initiated drilling, and technical data on hydrocarbon potential remains limited. Thailand argues the 2001 MOU yielded no tangible progress — pointing to only five rounds of ministerial talks in 25 years, with no surveys conducted, permits issued, or data exchanged. Its decision to terminate the MOU in May 2026 was not an abandonment of diplomacy, but an effort to recalibrate negotiations under a clearer legal framework.
Cambodia, invoking UNCLOS Annex V, has triggered compulsory conciliation, citing precedents like Timor-Leste and Australia to argue that even states resistant to binding adjudication can still reach mutually acceptable outcomes. Phnom Penh seeks a collaborative development arrangement — not as a concession, but as a path to shared benefits while the final boundary remains unresolved. Thailand, however, maintains that any resource extracted within 200 nautical miles of its coast naturally falls under its jurisdiction, per UNCLOS. Revenue-sharing discussions, if any, would follow rather than precede this legal reality.
Meanwhile, Koh Kood remains untouched not due to legal ambiguity, but because of deep cultural memory. In villages near Chanthaburi, older residents recall stories of French surveyors in 1907 marking borders with ink and compass. For them, the island is not a geopolitical asset — it is inheritance. Any conciliation report suggesting ambiguity around Koh Kood’s status will be firmly rejected by Thailand.
Behind the formal statements, a quiet tension lingers: prolonged uncertainty allows state-owned energy firms like EGAT and PTT to defer large-scale investments. That delay maintains current pricing structures — and institutional control. A settlement would bring not only new energy, but increased competition and downward pressure on electricity costs. For families in Eastern Thailand, the dispute isn’t about sovereignty or maps — it’s about whether their monthly power bills might eventually come down.
The conciliation commission is expected to issue non-binding recommendations within a year. But the real negotiation — over who benefits from the resources beneath the sea — has already begun, quietly, between ministries. And it’s not about peace.
It’s about the future of energy in Thailand.
