The arrondissement of Carcassonne occupies the northwestern part of the department and is bordered to the north by the Tarn department ( Midi-Pyrénées region ) , to the northeast by the Hérault department ( Languedoc-Roussillon region ) , to the east by the arrondissement of Narbonne , to the south by the Pyrénées-Orientales department ( Languedoc-Roussillon region ) , to the southwest by the arrondissement of Limoux , to the west by the Ariège department ( Midi-Pyrénées region ) and to the northwest by the Haute-Garonne department ( Midi-Pyrénées region ) .
The `` arrondissement '' covers the northwestern part of the department and is bordered to the north by the Tarn department ( Midi-Pyrénées region ) , to the northeast by the Hérault department ( Languedoc-Roussillon region ) , to the east by the `` arrondissement '' of Narbonne , to the south by the Pyrénées-Orientales department ( Languedoc-Roussillon region ) , to the southwest by the `` arrondissement '' of Limoux , to the west by the Ariège department ( Midi-Pyrénées region ) and to the northwest by the Haute-Garonne department ( Midi-Pyrénées region ) .