Indonesia–Malaysia border crossings. Illegal immigrants are also known to use such crossings. There are numerous scheduled sea crossings between Indonesia and Malaysia, mostly between ports in the former's island of Sumatra and Peninsula Malaysia. Here is a list of ports (Indonesian port followed by the Malaysian port) where scheduled boat services operate as of April 2008: Sumatra-Peninsula Malaysia North Kalimantan-Sabah Indonesia–Malaysia border The border between the Southeast Asian countries of Indonesia and Malaysia consist of both a land border separating the two countries' territories on the island of Borneo as well as maritime boundaries along the length of the Straits of Malacca,
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