There is nothing like Asian looking mountains. Such distinction is just based on where they found.
I meant these mountains, Huang Shan is a mountain range:
I mean, the largest mountain in this mountain range is 1.8km in height so it's not a small mountain range.
Mountains are more conical in shape with much larger extent (vertically and horizontally) (Example of mountain in Japan)
I agree, that's why I think Oda didn't do this feat good justice since he chose a more unusual mountain shape for this mountain range.
Generally, there is not a universal accepted term to differentiate between mountains and hills as this
article describes it (and just like you illustrated this fact in your post). But at the end, I think this discussion is even meaningless since it was already confirmed that the rock structure which Burgess lifted is an actual mountain in fact (not saying that this discussion ain't funny btw!).
Also, in this panel we see a much smaller rock structure which fits more as a hill, exactly where Burgess is standing:
Based on what we have seen in the chapter, it appears he lifted a hill and not mountain but as you highlighted it's the scaling and design issue otherwise Oda intention is to hype it as mountain lifting.
This mountain also resembles those of Onigashima and Amazon Lily.
Oda always had scaling issues with mountains, yet I don't understand why Oda didn't choose this kind of mountains:
Nobody would even question this feat if this mountain has the usual shape of more "common" mountains which largely extent both horizontally and vertically, just like in the pictures which you posted. But after seeing more panels, I think this mountain is fine.