instruction: What are the 13 departments and main communities of France's administrative region of Occitania?
context: Geography
  Occitania is the second-largest region in mainland France, covering an area of 72,724 km2 (28,079 sq mi); it has a population of 5,845,102 (2017). It has a Mediterranean coast on the southeast and is neighboured by Provence-Alpes-Côte d'Azur on the east, Auvergne-Rhône-Alpes on the northeast and Nouvelle-Aquitaine on the west and northwest, as well as foreign borders of Andorra (Canillo, Encamp, La Massana, Ordino) and Spain (Aragon and Catalonia) on the south.
  
  Departments
  Code	Arms 1	Department	Prefecture	Named after	Population (2017)
  09	Coat of arms of department 09	Ariège	Foix	Ariège River	153,153
  11	Coat of arms of department 11	Aude	Carcassonne	Aude River	370,260
  12	Coat of arms of department 12	Aveyron	Rodez	Aveyron River	279,206
  30	Coat of arms of department 30	Gard	Nîmes	Gardon River	744,178
  31	Coat of arms of department 31	Haute-Garonne	Toulouse	Garonne River	1,362,672
  32	Coat of arms of department 32	Gers	Auch	Gers River	191,091
  34	Coat of arms of department 34	Hérault	Montpellier	Hérault River	1,144,892
  46	Coat of arms of department 46	Lot	Cahors	Lot River	173,828
  48	Coat of arms of department 48	Lozère	Mende	Mont Lozère	76,601
  65	Coat of arms of department 65	Hautes-Pyrénées	Tarbes	Pyrenees	228,530
  66	Coat of arms of department 66	Pyrénées-Orientales	Perpignan	Pyrenees	474,452
  81	Coat of arms of department 81	Tarn	Albi	Tarn River	387,890
  82	Coat of arms of department 82	Tarn-et-Garonne	Montauban	Tarn River and Garonne River	258,349
  Major communities
  
  Toulouse, Occitania's prefecture and largest city
  
  The Pont du Gard from the Roman Era, one of Occitanie's main landmarks and tourist attractions
  The largest communes of Occitania are (population as of 2017:
  
  Toulouse (479,553)
  Montpellier (285,121)
  Nîmes (150,610)
  Perpignan (120,158)
  Béziers (77,177)
  Montauban (60,810)
  Narbonne (54,700)
  Albi (50,759)
  Carcassonne (47,365)
response: The 13 Departments of Occitania are:
  - Ariège
  - Aude
  - Aveyron
  - Gard
  - Haute-Garonne
  - Gers
  - Hérault
  - Lot
  - Lozère
  - Hautes-Pyrénées
  - Pyrénées-Orientales
  - Tarn
  - Tarn-et-Garonne
  
  The main communities located within Occitania are:
  - Toulouse (population: 479,553)
  - Montpellier (population: 285,121)
  - Nîmes (population: 150,610)
  - Perpignan (population: 120,158)
  - Béziers (population: 77,177)
  - Montauban (population: 60,810)
  - Narbonne (population: 54,700)
  - Albi (population: 50,759)
  - Carcassonne (population: 47,365)