古曾河

古曾河（），是丹麥的河流，位於日德蘭半島，由中日德蘭大區負責管轄，該河在15,000年前形成，河道全長176公里，流域面積3,300平方公里，河口處於蘭訥斯灣。

參考資料

• [http://www2.dmu.dk/1_viden/2_publikationer/3_fagrapporter/rapporter/fr340.pdf Miljø og Energiministeriet: Afstrømningsforhold i danske vandløb (2000), p. 16]
• [https://web.archive.org/web/20140221073619/http://gudenaakomiteen.silkeborgkommune.dk/files/Silkeborg%20Institutioner/Gudenaakomiteen/PDF%20Rapporter/Rapport%20nr.%2023.%20Fiskene%20i%20Guden%C3%A5ens%20vandl%C3%B8b.pdf The Fish in River Guden 2004], The Gudenaa Committee, Fig. 1-1 p.5
• [https://web.archive.org/web/20140221073619/http://gudenaakomiteen.silkeborgkommune.dk/files/Silkeborg%20Institutioner/Gudenaakomiteen/PDF%20Rapporter/Rapport%20nr.%2023.%20Fiskene%20i%20Guden%C3%A5ens%20vandl%C3%B8b.pdf The Fish in River Guden 2004] The Gudenaa Committee, Fig. 1-1 p.5
• [https://web.archive.org/web/20140221073258/http://gudenaakomiteen.silkeborgkommune.dk/forside/in+english The Gudenaa Committee]
• [http://bbs.keyhole.com/ubb/showflat.php/Cat/0/Number/1147599 Virtual journey on Gudenåen in Google Earth]
• [http://www.gudenaakomiteen.dk/ Gudenåkomitéen] A map of the river.