Indonesia-Singapore [ Report Number 5-11(2) ]
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The 2009 Treaty between Indonesia and Singapore relating to their territorial sea boundary in the western part of the Singapore Strait provides for a relatively short extension of their existing territorial sea boundary in this area concluded in 1973. The 2009 Treaty extends the two States’ existing territorial sea boundary in the central section of the Singapore Strait by defining three additional turning points (designated 1A, 1B and 1C) located to the west of Point 1 of the 1973 boundary delimitation.
Despite its short length of just over 6.5 nautical miles (M), challenges arose in the negotiation of the boundary with respect to baselines and the role of one of the numerous small islands that exist in the Singapore Strait. These issues were resolved over a four year long series of negotiations. The western extension of the Indonesia-Singapore territorial sea boundary has implications for a potential tripoint with Malaysia. Additionally, some technical issues which were specified in the 2009 delimitation have implications for the interpretation of the 1973 Treaty.