Venice was once a swamp.
That’s just its history. It, and the adjoining Marina del Rey area, were collectively a swampy marsh area that was converted into waterways. When oil was discovered, and cars became more important than gondolas, much of the canal network as filled back in to make roadways.

Now we have climate simulations that show us what the coastline would look like based on an increase in the mean sea-level elevation.
It doesn’t look good for Venice and the Marina. If you raise the sea level over 17 meters, you can see what the future coastline will look like.
If I were Lex Luthor, I’d buy land in Mar Vista.
Here are the area’s Flood Maps.

