https://www.bonsaiempire dot com In Japanese: Nebari - A very important aspect of a Bonsai is its Nebari (or: root-flare), the surface roots that provide visual balance to a tree.
Actually, up in Wisconsin we call them boulevards. It's legit:
Basically root flare, it's a commonly used term between bonsai enthusiasts. If you didn't know bonsai means growing trees in pots.
Unless you have an alternate definition, a boulevard is a road which generally contains a boulevard strip. Similarly, the item we call a cork is generally made of cork (wood). Context usually dictates.
Edited for clarity
Then what on earth do you call the boulevard?
That's a road verge not a boulevard.
These are surface roots forming what is called the 'nebari'.
Looks like an old Silver Maple 'acer saccharinum'
What kind of tree is that?
what's the 'nebari'?