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{{Infobox river 
| name = Prosna
| image = 
| image_caption = 
| source1_location = 
| mouth_location = [[Warta]]
| mouth_coordinates = {{coord|52.1417|N|17.6621|E|source:kolossus-dewiki|display=it}}
| progression       = {{RWarta}}
| length_km = 227
| discharge1_avg = {{convert|17.4|m3/s|abbr=on}}
| basin_size_km2 = 4917
}}
The '''Prosna''' is a river in central Poland, in the [[Odra (Baltic Sea)|Oder river]]  basin. The Prosna is a left tributary of the [[Warta]] river (near [[Pyzdry]]), with a length of 227 kilometres and a basin area of 4,917&nbsp;km<sup>2</sup> (all in Poland).<ref>[http://stat.gov.pl/download/gfx/portalinformacyjny/en/defaultaktualnosci/3328/2/17/1/statistical_yearbook_of_the_republic_of_poland_2017.pdf Statistical Yearbook of the Republic of Poland 2017], [[Central Statistical Office (Poland)|Statistics Poland]], p. 85-86</ref> Until 1918, it marked the westernmost border of the [[Russian Empire]]. The towns of [[Kalisz]] and [[Chocz]] were right on the old frontier. After the proclamation of the [[second Polish Republic]] it marked the border between interwar [[Germany]] and [[Poland]].<ref>{{Cite web |title=Curzon Line {{!}} Definition, Facts, & Border {{!}} Britannica |url=https://www.britannica.com/event/Curzon-Line |access-date=2023-02-17 |website=www.britannica.com |language=en}}</ref>

==Towns==
*[[Gorzów Śląski]]
*[[Praszka]]
*[[Wieruszów]]
*[[Grabów nad Prosną]]
*[[Kalisz]]
*[[Chocz]]

==See also==
* [[Rivers of Poland]]

==References==
{{Reflist}}

{{Polish rivers}}
{{Authority control}}

[[Category:Rivers of Poland]]
[[Category:Rivers of Opole Voivodeship]]
[[Category:Rivers of Łódź Voivodeship]]
[[Category:Rivers of Greater Poland Voivodeship]]


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