Arnhem is the capital of the Dutch province of Gelderland. It lies between the river Rhine and national park the Veluwe. It is also one of the few cities in the Netherlands that isn't entirely flat. The city has 143,582 inhabitants (July '07).
From the Arnhem Travel Guide
vienna to amsterdam
Taking a train will take some time and is not cheap but it is a very nice trip : Vienna (at) - Linz (at) - Passau (de) - Regensburg (de) - Nurnberg (de) - Wurzberg (de) - Frankfurt am Main (de) - Koblenz (de) - Dortmund (de) - Duisburg (de) - Arnhem (nl) - Utrecht (nl) - Amsterdam (nl) ...