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 at the 100 fathom isobath. In its 1979 territorial waters and continental shelf map, Malaysia claimed the area to be part of its continental shelf and depicted the Brunei-Malaysian border as running up to the 100 fathom isobath. Brunei did not recognise these assertions made by Malaysia. The Exchange of Letters signed on 16 March 2009 by the two countries provided for Malaysia's recognition of Brunei's territorial waters which it had earlier disputed. A joint committee is to determine the final maritime border between the two countries. See below for more on the dispute between the two countries. At its