Northern red oak - Quercus rubra
Possibly cultivated as is close to the See Through Church of Borgloon, in a farming area.
https://www.discoveringbelgium.com/the-see-through-church-of-borgloon/

"Quercus rubra", commonly called northern red oak or champion oak, is an oak in the red oak group. It is a native of North America, in the northeastern United States and southeast Canada.
Similar species: Beeches, Oaks, Walnuts
By Patomarazul
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Uploaded Sep 10, 2023. Captured May 14, 2022 12:55 in See-through church “Reading between the Lines”, Grootloonstraat 2, 3840 Borgloon, Belgium.