Indonesia–Malaysia border 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, in the South China Sea and in the Celebes Sea. The land boundary has a length of 2,019.5 km and stretches from Tanjung Datu at the northwestern corner of Borneo, through the highlands of the Borneo hinterland, to the Gulf of Sebatik and the Celebes Sea in the eastern side of the island. The boundary separates the Indonesian
Foreign relations of Brunei as close military relations with the latter island-state. Aside from relations with other ASEAN states, of which the Philippines, Indonesia, and Malaysia are key partners, Brunei also has extensive relations with the Islamic and Arab world outside its region. Brunei became a member state of the United Kingdom Commonwealth in 1984, ASEAN, the United Nations and the Organisation of Islamic Cooperation) in 1984, the Organisation of Islamic Cooperation, a major player in BIMP-EAGA in 1994., a founding member of the World Trade Organization (WTO) in 1995, Since 2009 Brunei and the Philippines signed a memorandum of understanding (MOU) that seeks