The remaining parts, especially those lying to the east of the delimited boundary, may require the involvement of Malaysia as the country also possesses territorial waters in the area.
[3][4] The new western end-point Point 1C is deemed to be located near but is not the tri-point for Indonesia, Malaysia and Singapore and tri-lateral negotiations will be further needed to determine where the maritime boundaries of the three countries meet.
[5] The 2009 extension uses the basepoints of Pulau Nipah in Indonesia and Singapore's Sultan Shoal, which has virtually been surrounded by reclaimed land.
This final gap will require trilateral negotiations among the three countries which are not expected to take place soon as it is dependent on the delimitation of the Indonesia–Malaysia maritime boundary in the southern portion of the Straits of Malacca, as well as the delimitation of the remaining portion of the Malaysia–Singapore border in the western part of the Straits of Singapore.
Another portion will be located further east between Pedra Branca, which the International Court of Justice awarded to Singapore in 2008 in a dispute with Malaysia, and Indonesia's Bintan island.
[7] The solving of the sovereignty dispute between Malaysia and Singapore over Pedra Branca, Middle Rocks and South Ledge has also resulted in Malaysia and Singapore starting technical negotiations to determine their common border, which is necessary before the tripoints can be determined.
The Indonesia–Singapore border came into being as part of the imaginary line created by the 1824 treaty between Great Britain and the Netherlands which divided up the Malay archipelago into spheres of influence between the two colonial powers.