Brunei–Malaysia border which are defined by agreements, from west to east, are as follows: Brunei and Malaysia in an Exchange of Letters on 16 March 2009, agreed to affirm the five agreements. The two countries also agreed to use the watershed principle to determine the remaining undelimited portions of the border. Brunei's maritime boundary with Malaysia until the 100 fathom isobath was inherited from the Sarawak (Definition of Boundaries) Order in Council 1958 No 1518 and the North Borneo (Definition of Boundaries) Order in Council 1958 No 1517, both of which defined the boundary between Brunei on the one hand, and Sarawak
Brunei–Malaysia border (Definition of Boundaries) Order in Council, 1958. It asserts that its eastern boundary extends from the 100 fathom isobath at to while the western boundary extends from the 100 fathom isobath at to . The EEZ outer limit runs between the two distant points parallel to the coast. Brunei's EEZ claim would include waters surrounding the Spratly Islands in the South China Sea. The area claimed by Brunei however does not include any islands but includes Louisa Reef, which is currently occupied by Malaysia. Until 2009, Malaysia did not recognise Brunei's EEZ claim and stated that Brunei's maritime territories ended