I remember cycling through here and thinking it was nice
Parc naturel régional de l'Avesnois +33 3 27 77 51 60 https://maps.app.goo.gl/NR2y7iyDcTohaJJk9
Then Ardennes below also.
That would be my recommendation too, easily the best riding I know within about 3 hours of Calais.
@skinny started
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I remember cycling through here and thinking it was nice
Parc naturel régional de l'Avesnois
+33 3 27 77 51 60
https://maps.app.goo.gl/NR2y7iyDcTohaJJk9
Then Ardennes below also.