This is the 1740th most frequent French word.
belges
"Belges" means "Belgians" (people from Belgium).
Here, 'belges' is used as an adjective modifying the noun 'étudiants'.
Les étudiants belges sont très compétents.
The Belgian students are very competent.
In this sentence, 'belges' serves as an adjective again, describing the noun 'villes'.
Nous avons visité des villes belges cet été.
We visited Belgian cities this summer.
Here, 'Belges' is a noun referring to individuals from Belgium.