What is the best word that defines the space shown in this picture?

American Heritage Dictionary defines:

plaza: a public square or similar open area in a town or city.

gallery: a roofed promenade, especially one extending along the wall of a building and supported by arches or columns on the outer side.

Which is the better word defining the space shown in the picture below: "plaza" or "gallery"? Or is there a more appropriate word?

enter image description here


Perhaps, the word arcade would do.


Perhaps 'covered walkway' would be appropriate.


A colonnade is "a structure composed of columns placed at regular intervals."

A colonnade at the Acropolis:

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