on the edge of ,on the border of 有区别吗？

Longman字典的解释是（英文版的，看起来容易体会）
[on the edge of something] close to the point at which something different, especially something bad, will happen:
1.Their economy is on the edge of collapse.
2.She is on the edge of despair.

[on the border of]:the official line that separates two countries, states, or areas, or the area close to this line:
1.a market town on the border of England and Wales

前者侧重指程度，后者指方位。

第一个是在什么的边缘
第二个是指在分界处

on the edge of 著重于本体的边缘
on the border of 著重于本体与外体之间，也可指边缘