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The Vidrus fluvius, Greek Ouidros potamos, is a river of Ptolemy's ''Geographia'' (2.10) located in greater Germany. Its exact location is not known for certain, but it must be in the lowlands. Ptolemy places the mouth of the Vidrus next to the mouth of the Rhine. Next in order follows a port, Marnamanis, and then the mouth of the Amisius, or Ems. The next river in that direction is the Visurgis, which has to be the Weser River. Ptolemy said that the Rhine had three mouths, one of which was in the "west". It has been proposed that this might have meant the mouth of the IJssel, which today flows from the Rhine near Arnhem. But it did not originally connect to the Rhine, the Romans themselves, under the command of Drusus, joined the two with a canal. Both the Vecht and the IJssel flowed to the IJsselmeer, formerly the Zuiderzee, which one Roman source (Pomponius Mela) called ''Flevus Lacus''. The Romans were able to send fleets of ships into the Lakes and from there to access the Ems. Another older connection from the Rhine to the lakes was the Vecht. Although the Romans apparently did not consider it navigable, it possibly gave access to the old IJ, and from there to Velsen where there was a Roman fortification on the coast, apparently the same one which Tacitus referred to as Flevus. Most scholars (including Smith, Van der Aa, Bruijnesteijn and Anthon) equate the Vecht and the Vidrus. Ortelius says that the Vidrus was the old name for the Regge, a tributary of the Vecht. Etymologically Vidrus is close to Indo-European *wod-or, which becomes Germanic *watar by Grimm's Law. The d stays on for Germanic *wed-, becoming wet, and there is an –sk- form as well, *wat-skan, "to wash", which might account for the Vecht form. A derivation from "water" is consistent with Ortelius' statement that parts of Holland were called "Waterland." ==References== 〔 * * * * * (【引用サイトリンク】title=Apparatus and Notes to Ptolemy, Book II, Chapter 10: Germania Magna ) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Vidrus」の詳細全文を読む スポンサード リンク
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