The Radunia Canal is a historical canal constructed in the Middle Ages, in the XIV century, by the Teutonic Knights - in Roumen Arsov, Jiri Marsalek, Evzen Zeman: Urban Water Management: Science, Technology, and Service Delivery, p. 117 (Scheme of hydrographical network in Gdansk) [8] [1]
A Gazetteer of the World: Or, Dictionary of Geographical Knowledge, edited by Royal Geographical Society Great Britain, 1856, and The Edinburgh Gazetteer, Or Geographical Dictionary, 1822[2]
