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The outflow of the Dragonja into the Gulf of Piran
CountrySlovenia, Croatia
Physical characteristics
 ⁃ locationPoleti?i (Koper)
 ⁃ elevation315 m (1,033 ft) [1]
 ⁃ location
Adriatic Sea, Se?ovlje Saltpans
 ⁃ coordinates
45°28?42?N 13°35?10?E / 45.47833°N 13.58611°E / 45.47833; 13.58611Coordinates: 45°28?42?N 13°35?10?E / 45.47833°N 13.58611°E / 45.47833; 13.58611
Length30 km (19 mi) [1]
Basin size95.6 km2 (36.9 sq mi)

The Dragonja (pronounced [d?a'?o:nja]; Italian: Dragogna) is a 30-kilometre (19 mi) long river[1] in the northern part of the Istrian peninsula. It is a meandering river with a very branched basin and a small quantity of water. It has the pluvial regime[2] and often dries up in summer.[3] It features very diverse living environments and is home to a number of animal and plant species.[4] The Dragonja has been a matter of a territorial dispute between Croatia and Slovenia, with its lowest portion de facto the border of the two countries.[5]


The river is the third longest river in Istria, after the Ra?a and Mirna rivers. It is the largest river of the Slovenian coast that flows into the Adriatic Sea.[6] It is also the only Slovenian river that does not flow through settlements and that flows in its entirety over the flysch terrain.[6]

The Dragonja originates from several sources in the ?avrin Hills and flows west to the Gulf of Piran, part of the northern Adriatic Sea.[3] It is joined by two larger tributaries from the right side (Rokava and the Drnica Creeks) and one larger tributary from the left side (Poganja Creek).[3]

The Se?ovlje Salina Landscape Park with the Se?ovlje Saltworks is located at its mouth. The lowest part of the Dragonja in the Municipality of Piran has been protected since 1990 as a natural monument.[3]


The Dragonja River was first attested in written sources as Argao (ablative Argaone),[7] and in later sources as Argaone (in 670), per Argaonem (in 1035), Dragugne (in 1100), and super flumine Dragone (in 1389). The modern Slovene and Italian names (with initial D-) are derived from Slavic *Dorgon'a, from Romance d- (< ad 'at') + Argaon- (with metathesis). Ultimately, the name is of pre-Romance origin, presumably based on the Proto-Indo-European root *h2arg'- 'shining'.[8][9]

Non-linguistic accounts explain the name as based on the meandering course of the river, resembling a dragon (Italian: drago).[3]

Territorial dispute

In the lower reaches of the Dragonja, there is a territorial dispute between Slovenia and Croatia: while Croatian authorities claim that the Dragonja is a border river, Slovenia claims a strip of territory south to the river as well.[10] As of 2012, the last 7 kilometres (4.3 miles) of Dragonja's course is de facto border of Croatia and Slovenia.[] The disputed territory contains four hamlets and Croatia's Plovanija border crossing.[11] Dragonja River became a district border river after World War II, when the Yugoslav-administered Zone B of the Free Territory of Trieste (FTT) was split into the Koper and Buje districts. After dissolution of the FTT in 1954 and transfer of its former Zone B to Yugoslavia, Koper district became a part of Slovenia while Buje district was attached to Croatia.[12]



  1. ^ a b c Rivers, longer than 25 km, and their catchment areas, Statistical Office of the Republic of Slovenia
  2. ^ Bre?ko Grubar, Valentina; Kova?i?, Gregor (2010). "Pokrajinskoekolo?ka oznaka jadranskega povodja v Sloveniji s poudarkom na kakovosti vodnih virov" [Landscape Ecological Characterization of the Adriatic Sea Basin in Slovenia with an Emphasis on Water Resource Quality]. Annales. Series historia et sociologia (in Slovenian). 20 (1): 153-168.
  3. ^ a b c d e Trobec, Tanja. "Dragonja" [The Dragonja]. In ?mid Hribar, Mateja; Gole?, Gregor; Podjed, Dan; Kladnik, Drago; Erharti?, Bojan; Pavlin, Primo?; Ines, Jerele (eds.). Enciklopedija naravne in kulturne dediine na Slovenskem - DEDI [Encyclopedia of Natural and Cultural Heritage in Slovenia] (in Slovenian). Archived from the original on 26 April 2012. Retrieved 2012.
  4. ^ Vovk Kor?e, Ana; Vrhov?ek, Danijel (2008). "Mo?nosti sonaravnega regionalnega razvoja v pore?ju Dragonje z ekoremediacijami" [The Opportunities for a Natural Regional Development in the Dragonja Basin with Ecoremediations] (PDF). Ekolist: revija o okolju (in Slovenian) (5): 24-29. ISSN 1854-3758. Archived from the original (PDF) on 2010-12-17.
  5. ^ Pipan, Primo? (2008). "Border dispute between Croatia and Slovenia Along the Lower Reaches of the Dragonja River" (PDF). Acta Geographica Slovenica (in English and Slovenian). 48 (2): 343. doi:10.3986/AGS48205.[permanent dead link]
  6. ^ a b Krivograd Klemen?i?, Aleksandra; Vrhov?ek, Danijel; Smolar-?vanut, Nata?a (31 March 2007). "Microplanktonic and Microbenthic Algal Assemblages in the Coastal Brackish Lake Fiesa and the Dragonja Estuary (Slovenia)". Natura Croatica. Croatian Natural History Museum. 16 (1).
  7. ^ Kos, Milko. 1985. Srednjeve?ka zgodovina Slovencev. Ljubljana: Slovenska matica Ljubljana, p. 137.
  8. ^ Snoj, Marko (2009). Etimolo?ki slovar slovenskih zemljepisnih imen. Ljubljana: Modrijan. pp. 212-122.
  9. ^ Bezlaj, France. 1967. Eseji o slovenskem jeziku. Ljubljana: Mladinska knjiga, p. 81.
  10. ^ Pipan, Primo? (2008). "Border dispute between Croatia and Slovenia along the lower reaches of the Dragonja River" (PDF). Acta geographica Slovenica. 48 (2): 331-356. doi:10.3986/AGS48205. Retrieved 2010.
  11. ^ "Drnov?ek: Granica na Dragonji ako se uva?i sporazum s Ra?anom" [Drnov?ek: The border is at Dragonja if Ra?an agreement is respected] (in Croatian). Index.hr. 27 August 2004. Retrieved 2012.
  12. ^ Damir Josipovi? (June 2012). "Slovenian-Croatian boundary: Backgrounds of boundary-making and boundary-breaking in Istria regarding the contemporary border dispute". Geoadria. Croatian Geographic Society, University of Zadar. 17 (1): 25-43. ISSN 1331-2294. Retrieved 2012.

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