How to set believable boundaries for my urban city scene?

I have a survival game where player can roam around in cities. I have this scene that takes inspiration of Miami ocean drive. Please see attached image. Can you suggest some believable and aesthetically fitting boundaries? I don't want to just put fences and road blocks. Right now I put some large building complex as boundary but idk.. they look sort of bad?

I am thinking putting ocean on one side but what about the rest?

Is there a way to make the graphics really blurry close to the border?

 

If it’s a survival game what’s the story? Maybe bombed out bridges, barricades, etc.