Hauts-de-France

Oise (60)

📍 49.41670000, 2.83330000

Geology:
Calcaire lutétien, craie du Crétacé

Capacity: 1,000 personnes

Compiègne State Forest. Stable geology, deep water table, low seismic risk area.

Grand Est

Ardennes (08)

📍 49.76670000, 4.71670000

Geology:
Schistes ardoisiers, grès du Dévonien

Capacity: 1,000 personnes

Ardennes Massif. Hard rock, low population, dense forest cover.

Bourgogne-Franche-Comté

Haute-Marne (52)

📍 47.86670000, 5.33330000

Geology:
Calcaire du Jurassique, plateau stable

Capacity: 1,000 personnes

Langres Plateau. Altitude 450m, excellent limestone geology, extensive forests.

Grand Est

Vosges (88)

📍 48.20000000, 6.95000000

Geology:
Grès et granit vosgien, massif ancien

Capacity: 1,000 personnes

Vosges Regional Natural Park. Stable mountain range, abundant water access.

Bourgogne-Franche-Comté

Nièvre (58)

📍 47.21670000, 4.00000000

Geology:
Granit et gneiss, socle hercynien

Capacity: 1,000 personnes

Morvan Natural Park. Granite massif, natural lakes, sparsely populated area.

Occitanie

Lot (46)

📍 44.58330000, 1.55000000

Geology:
Calcaire karstique, nombreuses grottes

Capacity: 1,000 personnes

Quercy Causses. Natural underground network, thick limestone, arid zone.

Bretagne

Finistère (29)

📍 48.40000000, -3.81670000

Geology:
Grès armoricain, schistes précambriens

Capacity: 1,000 personnes

Arrée Mountains. Brittany's highest point, ancient bedrock, geographical isolation.

Nouvelle-Aquitaine

Corrèze (19)

📍 45.68330000, 2.00000000

Geology:
Granit du Massif Central, tourbières

Capacity: 1,000 personnes

Millevaches Plateau. Altitude 900m, Limousin water tower, very low density.

Bourgogne-Franche-Comté

Jura (39)

📍 46.66670000, 5.90000000

Geology:
Calcaire jurassique, karst développé

Capacity: 1,000 personnes

Jura Massif. Stratified limestone geology, numerous natural recesses.

Occitanie

Lozère (48)

📍 44.36670000, 3.61670000

Geology:
Schistes et granit cévenol, relief escarpé

Capacity: 1,000 personnes

Cévennes National Park. Mountainous terrain, low accessibility, excellent natural defense.

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