American walnut tree in the park of the Abbey of Val Dieu, Wallonia, Belgium.
<a href="//commons.wikimedia.org/wiki/User:Horst_J._Meuter" title="User:Horst J. Meuter">Horst J. Meuter</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>