yes
Adobe houses.
Chinampas.
No. It is a natural gulf.
Natural
10
None. There is only the man-made border that separates the US from Mexico.
roro
hey what up bro
Both. Its geography, natural resources or climate are natural-made; the country or political entity itself and the infrastructure that supports it as an independent nation are man-made.
Some of them include roads, vehicles, machinery and equipment, as well as technology.
Chichen Itza is just one example.