The continental boundary between Asia and Australia is somewhere in the Wallacean region of the Malay Archipelago. The boundary is most commonly divided along the anthropologic Melanesian Line or the biogeographic Weber's Line. Indonesia administers the western half of New Guinea, geographically a part of the Australian continent. The eastern half of the island is a part of Papua New Guinea which is considered to be a part of Oceania. Indonesia is commonly referred to as one of the Southeast Asian countries. East Timor, an independent state that was formerly a part of Indonesia, which is geographically a part of Asia, is classified by the United Nations as a part of the South-eastern Asia subregion. It is expected to join the Association of Southeast Asian Nations, having been involved as an ASEAN Regional Forum member since independence, and has participated in the Southeast Asian Games since 2003. Occasionally, all of the Malay Archipelago is included in Oceania, although this is extremely rare, especially as most of the archipelago lies on the Asian continental shelf.