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The Radunia (German: 'Radaune') is a small river in Kashubia (Pomerelia), which issues from a lake and falls into the Motława (Mottlau) near Gdańsk (Danzig).
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Map of Radunia, Poland
A part of its water is conveyed into the city via the 13.5 km long Radunia Channel (Kanał 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 (Große Mühle).
Its source is Jezioro Stężyckie (Stendsitzer See) near Stężyca (Stendsitz). Near Krępiec (Krampitz), Radunia joins the Motława, a tributary to the Vistula (Weichsel) in Gdańsk. Length is 103,2 km, area 837 km², with a height difference of 162 m. Places along the river are Żukowo (Zuckau) and Pruszcz Gdański (Praust), with 22,000 inhabitants.
From 1910 to 1937, eight water power stations were built, delivering 14 MW in total.