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; it has a population of 5,845,102. 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 and Spain on the south.

Departments
Code	Arms 1	Department	Prefecture	Named after	Population 
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 
Montpellier 
Nîmes 
Perpignan 
Béziers 
Montauban 
Narbonne 
Albi 
Carcassonne 

Answer: 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)