The Radunia (; ) is a small river in Kashubia (Pomerelia) in northern Poland, which issues from a lake and falls into the Motà Âawa near the city of Gdaà Âsk.
Part of its water is conveyed into the city via the 13.5 km long Radunia Canal (Kanaà  Raduni (pl) / Radaunekanal (de)) or New Radaune, a canal built in the 14th century by Teutonic Knights, to provide water and power to operate the Great Mill.
Its source is Lake StÃÂà ¼yckie near StÃÂà ¼yca. Near KrÃÂpiec, the Radunia joins the Motà Âawa, a tributary to the Vistula in Gdaà Âsk. The length of the Radunia is 103,2 km, area 837 kmò, with a height difference of 162 m. Places along the river are à »ukowo and Pruszcz Gdaà Âski, with 22,000 inhabitants.
From 1910 to 1937, eight water power stations were built, delivering 14 MW in total.