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A maritime border dispute between Thailand and Cambodia framed by UNCLOS talks
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Thailand draws a line in UNCLOS talks over Koh Kut

Thailand is narrowing UNCLOS talks to the maritime border, excluding Koh Kut and land issues as tensions with Cambodia continue.

15 Sep 20263 min read

Thailand has told Singapore that UNCLOS talks with Cambodia must stay focused on the maritime border. The exact focus_keyword, UNCLOS talks, now sits at the centre of a dispute that Bangkok insists should exclude Koh Kut and all land-border issues.

Thailand has entered a new phase of its maritime dispute with Cambodia, using UNCLOS talks in Singapore to draw a firm boundary around what can and cannot be discussed. Bangkok wants the process limited to the sea border and kept separate from Koh Kut and any land issues.

Bangkok narrows the agenda

Foreign Minister Sihasak Phuangketkeow has closed down room for interpretation. Thailand is sending a clear message that the talks with Cambodia must deal only with the maritime border. In Bangkok’s view, Koh Kut is outside the scope of the conciliation commission.

That distinction matters because Koh Kut is not only a symbolic issue. It is also political. The Thai government is trying to prevent the island from becoming part of a wider negotiation over influence and resources.

Why Koh Kut is sensitive

Koh Kut lies in Trat province, close to the Cambodian border. Its location makes every move in the maritime dispute resonate far beyond diplomatic circles. In Thai debate, the island has become a reference point for a larger question: can negotiations over the sea indirectly weaken the state’s position on land?

Bangkok’s answer is no. Officials argue that a maritime border can be treated as a technical matter, but sovereignty over the island cannot. That is why the government is separating the two issues so firmly in Singapore.

Thailand rejects Cambodia’s 1972 line

Thailand also rejects Cambodia’s 1972 claim line and says it has no legal basis. This is not, in Bangkok’s view, a simple map dispute. It is a contest over where state sovereignty ends and where negotiations under the law of the sea begin.

The Thai position fits a wider policy line: Thailand is willing to talk under UNCLOS, but it does not want the conciliation process to drift into a land-sovereignty dispute. The government also says explicitly that it does not recognise Cambodia’s 1972 continental shelf line.

What the Singapore process means

The conciliation commission was created under UNCLOS to help the two countries seek a solution. Thailand says it will cooperate, but it wants full control over the scope of the talks. That makes the first meeting important not only procedurally, but politically.

If the parties keep the discussion within maritime law, political pressure may ease. If Koh Kut returns to the table, tensions could rise quickly.

For readers following the issue, the key point is simple: these UNCLOS talks are not ending the dispute yet, but they are defining its frame. Thailand is trying to keep the island out of the process and the sea border at its centre.

  • Watch whether official statements refer only to the maritime border.
  • Separate UNCLOS procedure from any broader sovereignty dispute.
  • If you are travelling to eastern Thailand, follow diplomatic updates, but do not assume immediate changes to tourism conditions.