The northern route through the Gap passes south of the Knüllgebirge and then continues around the northern flank of the Vogelsberg Mountains; the narrower southern route passes through the Fliede and Kinzig Valleys, with the Vogelsberg to the north and the Rhön mountains and Spessart mountains to the south.
Knüllwald lies in the Knüllgebirge, a low mountain range, between the rivers Efze and Beise, south of Kassel.
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By state law on 1 January 1974, the communities of Berndshausen, Niederbeisheim and Rengshausen were amalgamated with the already extant greater community of Knüllwald, thereby forming one of Hesse's biggest polycentric communities.
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Knüllwald is a community in the Schwalm-Eder district in Hesse, Germany.