The valley in the moutain allowed invadors to pass (I think this is right...)
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I would say it is- by "physical," I would assume they mean "man-made," otherwise they would have used "natural". Pyramids are man-made, and therefore what I would call a "physical feature".
No, because it's not a natural physical feature, instead it is a landmark.
Corsica is an island in the Mediterranean Sea.
The Andes Mountains
The physical feature that forms Uruguay's western boundary with Argentina is the Uruguay River. It also forms part of the Brazilian-Argentine border.