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–Indonesia relations Indonesia established diplomatic relations with Brunei Darussalam on 1 January 1984. Brunei Darussalam was recognised by Jakarta on independence in 1984, with Indonesia dropping any claims on the Sultanate in the process. Indonesia also supported Brunei membership to ASEAN in 1984. Brunei has been a popular destination for Indonesian workers. As per 31 August 2012, there is around 58,000 Indonesian citizens are staying and working in Brunei. Bilateral trade volume in 2011 reached around US$1.1 billion, coupled with around 3,500 Indonesian products in Brunei's market. In line with Brunei's economic diversication policy, the two countries are seeking to enhance co-operation