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![[Flag]](../images/b/ba-rs-ko.gif) image by Tomislav Šipek, 7 July 2024
 image by Tomislav Šipek, 7 July 2024
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The municipality of Kostajnica (5,977 inhabitants in 2013; 851 ha) is located 
on the border with Croatia, here river Una; which separates it from Hrvatska 
Kostajnica.
One of the youngest municipalities in Republika Srpska, 
Kostajnica was established in 1995, separating from Novi Grad, as Srpska 
Kostajnica, to be subsequently renamed to Bosanska Kostajnica and, eventually, 
Kostanjica.
Ivan Sache, 6 May 2022
The flag of the Municipality of Bosanska Kostajnica is white with the 
municipal coat of arms in the center, as is described in the Statute of the 
Municipality, adopted on 31.03.2016 
https://www.opstina-kostajnica.com/images/stories/Statut_optine_Kostajnica_5_16.pdf  
The flag and arms of Kostanjica are prescribed in Article 6 of the Municipal 
Statutes, last amended on 31 March 2016 and published on 6 April 2016 in the 
municipality's official gazette No. 5.
(4) The flag of the municipality 
is rectangular in shape, two to one, white with the coat of arms of the 
municipality in the center.
Ivan Sache, 6 May 2022
![[Town flag]](../images/b/ba-rs-ko1.gif) images by Tomislav Šipek, 7 July 2024
 images by Tomislav Šipek, 7 July 2024
The municipality uses both variants of the flag.
https://radiokostajnica.com 
https://posavina.org 
https://www.glassrpske.com
 Tomislav Šipek, 7 July 2024
The flag and arms of Kostanjica are prescribed in Article 6 of the Municipal Statutes, last amended on 31 March 2016 and published on 6 April 2016 in the municipality's official gazette No. 5.
(3) The coat of arms of the municipality has the shape of a shield, in the central part of which is the fruit [chestnut] after which Kostajnica was named, and in the lower part two chestnut leaves that frame the shield in brown. Above the two leaves, the blue color represents river Una; on the right the Old Town is symbolically represented, and on the left the bridge over river Una. The shield's center is green; the two hills symbolize hill Balj, known for its chestnut forest. The upper part of the shield is blue, representing the sky; with the lower part, which is also blue, it gives a certain symmetry to the coat of arms. At the top of the shield is the flag of Republika Srpska, slightly fluttering. The masonry stone blocks framing the sides of the coat of arms symbolize struggle and construction. In the upper part of the coat of arms is the year "1258", when Kostajnica was first mentioned as a settlement in written documents.
Ivan Sache, 6 May 2022
In the central part of the emblem there is a bridge over the Una and the Old 
Town, which are actually located on the territory of the Republic of Croatia. 
Can the coats of arms of local communities contain elements that are not on 
their territory, in fact they are in another country?
Tomislav Šipek, 
7 May 2022
I think that the municipal coat of arms refers to the old Town Kostajnica as 
one medieval town, that now is divided between Bosnia and Croatia, but once was 
one city Castanowiz.
Valentin Poposki, 7 May 2022
The problem here is that the coat of arms is more political than heraldic, in 
fact heraldic is not at all.
The Germanized name Castanowiz refers more to 
the Croatian Kostajnica than to the Bosnian one. Namely, there was a customs on 
the way from the Ottoman Empire to Vienna, and hence the German name of the 
place. The Kostajnica area (on both sides of the Una) first came into contact 
with the German language in 1526 with the accession of Croatia to the Habsburg 
Empire, but soon the whole area fell into the hands of the Turkish Empire. After 
more than 100 years, now the area of Hrvatska Kostajnica became part of the 
Habsburg Empire at the end of the 17th century, while Bosanska Kostajnica 
entered the Habsburg Empire only in 1878, but then disappeared the importance of 
Kostajnica as a major customs settlement.
Tomislav Šipek, 14 May 
2022