Ballay is located some 35 km east by south-east of Rethel and 3 km north of Vouziers. Access to the commune is by the D977 road from Vouziers which passes through the centre of the commune and the village and continues north to Quatre-Champs. The D19 road from Quatre-Champs to Vandy forms part of the northern border of the commune. Apart from the village there are the hamlets of Claire-Fontaine, Landèves, and La Noue Adam. The commune is mostly forested in the east and west with farmland down the centre.[3]
The Aisne river forms the south-western border of the commune as it flows north to eventually join the Oise at Clairoix. The Fournelles flows through the centre of the commune from the north and joins the Aisne on the south-western border. Several tributaries rise in the commune and feed the Fournelles including the Martignère, the Ruisseau du Moulin des Bois, and the Chalan which forms part of the southern border of the commune.[3]
Clairefontaine and Landèves were municipalities in 1790 and merged into Ballay at the end of 1790.
In the 12th century Ballay was a lordship with a castle and a parish with a church dedicated to Notre-Dame which was an annex to Vandy. An Augustinian Priory, Notre-Dame of Landèves, was founded at Landèves in 1219 by two brother lords of Bally who made it religious. Since its foundation the priory served the parish of Ballay. The priory became an abbey in 1623. The abbey and church were destroyed during the French Revolution.
The inhabitants of the commune are known as Ballayriots or Ballayriottes in French.[5]
Historical population
Year
Pop.
±% p.a.
1793
434
—
1800
502
+2.10%
1806
490
−0.40%
1821
447
−0.61%
1831
461
+0.31%
1836
473
+0.52%
1841
475
+0.08%
1846
473
−0.08%
1851
471
−0.08%
1866
417
−0.81%
1872
390
−1.11%
1876
375
−0.98%
1881
350
−1.37%
1886
382
+1.77%
1891
374
−0.42%
1896
373
−0.05%
1901
336
−2.07%
Year
Pop.
±% p.a.
1906
332
−0.24%
1911
346
+0.83%
1921
331
−0.44%
1926
303
−1.75%
1931
283
−1.36%
1936
300
+1.17%
1946
307
+0.23%
1954
290
−0.71%
1962
315
+1.04%
1968
267
−2.72%
1975
265
−0.11%
1982
230
−2.00%
1990
254
+1.25%
1999
245
−0.40%
2007
242
−0.15%
2012
247
+0.41%
2017
289
+3.19%
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