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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.
Only the deanery of Geisa in the Thuringian Rhön Mountains was returned to the diocese of Fulda, by virtue of their very close historical connection.