Zadrna

Zadrna
Zadrna River in Kamienna Góra
Origin	Góry Krucze near Błażejów 50°39′40.5″N 16°1′44.1″E / 50.661250°N 16.028917°E / 50.661250; 16.028917
Mouth	Bóbr in Kamienna Góra 50°47′12″N 16°2′21″E / 50.78667°N 16.03917°E / 50.78667; 16.03917Coordinates: 50°47′12″N 16°2′21″E / 50.78667°N 16.03917°E / 50.78667; 16.03917
Basin countries	Poland
Length	16 km (9.9 mi)
Source elevation	600 m (2,000 ft)
Mouth elevation	440 m (1,440 ft)
Basin area	112 km2 (43 sq mi)

Zadrna (German: Zieder) is a river in Lower Silesian Voivodeship in southwestern Poland, a right tributary of the Bóbr. It rises in the Góry Krucze range of the Central Sudetes near the village of Błażejów, close to the border with the Czech Republic.