It is a hilly countryside , the main mountainchains being the RhÃ n , the Westerwald , the Odenwald , the Taunus and the Spessart . The countryside is hilly and there are numerous mountain ranges , including the RhÃ n , the Westerwald , the Taunus , the Vogelsberg , the KnÃ 1\/4 ll and the Spessart .