Kostajnik (Serbian Cyrillic: Костајник) is a village in Serbia. It is situated in the Krupanj municipality, in the Mačva District of Central Serbia. Kostajnik is notable for being a fortified village since 1445. The village had a Serb ethnic majority and a population of 1,048 in 2002.
44°25′36.84″N 19°17′53.88″E / 44.4269000°N 19.2983000°E / 44.4269000; 19.2983000
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