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Pematangsiantar (sometimes written as Pematang Siantar, acronym PS or P. Siantar, colloquially just Siantar), is an independent city in North Sumatra, Indonesia, surrounded by, but not part of, the Simalungun Regency. Pematangsiantar formerly had the status of a second level district (daerah tingkat dua) and was the administrative centre of the surrounding Regency, but it has recently been elevated to Kota (City) and separated from the Regency.