| Kwisa | |
| River | |
 Bridge at Gryfów Śląski
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| Country | Poland |
|---|---|
| Region | Lower Silesian Voivodeship, Lubusz Voivodeship |
| Source | Izerskie Garby, Jizera Mountains 50°51′8″N 15°24′9″E / 50.85222°N 15.4025°E |
| Mouth | Bóbr at Żelisław 51°34′33″N 15°23′39″E / 51.57583°N 15.39417°ECoordinates: 51°34′33″N 15°23′39″E / 51.57583°N 15.39417°E |
| Length | 127 km (79 mi) |
| Basin | 1,026 km2 (396 sq mi) |
 Confluence of Kwisa and Bóbr
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The Kwisa [ˈkfisa] (German: Queis) is a river in south-western Poland, a left tributary of the Bóbr, which itself is a left tributary of the Oder river.
It rises in the Izera Mountains, part of the Western Sudetes range, where it runs along the border with the Czech Republic. It then flows northwards along the towns of Świeradów-Zdrój, Mirsk, Gryfów Śląski, Leśna, where it is dammed at the Lake Leśnia reservoir, Lubań, Nowogrodziec and Kliczków. It finally joins the Bóbr river approximately 2 kilometres (1.2 mi) north-west of Małomice and 5 km (3.1 mi) south-east of Żagań. For most of its length it is in Lower Silesian Voivodeship, but it also flows through Lubusz Voivodeship for several kilometres before reaching its mouth.
From about 937 the eastern outskirts of the Saxon Marca Geronis, established in conquered lands settled by West Slavic Sorbian tribes, reached to the banks of the Kwisa. After its 965 partition, the western lands were part of the Margraviate of Meissen, while the adjacent territory to the east was gradually incorporated into the Silesian region of the Early Polish state under the Piast duke Mieszko I until 992. His successor Bolesław I Chrobry further extended the Polish reach of power to the west, campaigning the Milceni lands around Bautzen (Budissin), which in 1018 Emperor Henry II the Saint ceded to him according to the Peace of Bautzen.
The Land Budissin, later called Upper Lusatia, was reconquered by Emperor Conrad II in 1031 and enfeoffed to Duke Vratislaus II of Bohemia in 1071, while the territory east of the Kwisa remained part of the Duchy of Silesia, which from 1163 was held by the Silesian Piast dynasty. From that time on the river marked the border between the historical regions of Lower Silesia - the Duchy of Legnica from 1248 - to the east and Upper Lusatia to the west. Together with the lower Bóbr, it was one of the rivers considered as a possible marker of the Polish–German border after World War II, during the negotiations that finally led to the establishment of the Oder–Neisse line.
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