In any case the name is not signed on the gound , or on the map present on entry.

User put name based on this : https://environnement.brussels/sites/default/files/content/jardins_fleuriste_nl.pdf where names are more descriptive than offical (like Aromatische planten , Labyrinten ...). But they realy use Allee on the document. 

I believe that the doc is a support for visit , so guide can explain that in the past this way was connected to a bridge over the Witte-Acacialaan that the king can use it. 