Hrubý Jeseník (sometimes called High Ash Mountains in English; German: Altvatergebirge or Hohes Gesenke, Polish: Jesionik Wysoki) is a mountain range and geomorphological mesoregion of the Czech Republic.Jeseník (respectively Jesenný potok) was first the name of a stream that flowed through an ash forest in a valley.Hrubý Jeseník has an area of 530 square kilometres (200 sq mi) and an average elevation of 887.6 metres (2,912 ft).The town of Jeseník is located just beyond the borders of the mountain range.The most important are the national nature reserves Praděd, Šerák-Keprník, Rejvíz and Skřítek (Skřítek and Rejvíz extend only marginally into Hrubý Jeseník), and the Javorový vrch National Nature Monument.