What's the correct name for this raised tree bed?

Question

What's the correct name for this raised tree bed? This one was designed only for the tree. And it's not inside a garden, not even in a park, but at the corner of the street. Searching on Google I can find mostly raised garden beds that contain a tree and the flowers planted around them.

And what's the name of the raised beds used in the parks or on the street? Most of my search results are gardening raised beds.

_{(source: esi.info)}

Here are similar structures in Madrid.One of them:

Answer 1

The most correct term is tree isle. "Isle" implies it is a raised structure. In this Google search, you can see more examples, including some unusual, like this:

Of course, some structures can be called both tree isles and tree seats,but I think this question pertains more to tree isles.

Answer 2

It's just a raised bed with seating surround, meaning the slabs on top are wide enough for people to sit on, and it's built to a height that's reasonably comfortable for seating. They can be made of wood, but for long term situations where there's a tree in the middle, particularly on a street, they're more usually built of brick or stone, like this one. If it has a special name, I've never known an architect use one... but maybe there is.