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–Malaysia border their boundary issues and demarcate their common border according to the five historical agreements, of which the two directly concern Limbang, namely the 1920 agreement establishing the Pandaruan River as the Brunei-Sarawak border to the east of Limbang, and the 1933 agreement establishing the Brunei-Sarawak border to the west of Limbang. The two countries also agreed to use the watershed principle to fill in the gaps. This essentially reaffirms the current de facto boundary without major deviation. This led Malaysia to declare that the Limbang Question has been settled with Malaysia having unequivocal ownership over Limbang. Brunei however immediately denied