They don't actually appear 'right there'. Technically they have 'always' (?) been there. They weren't man made so, well, they were made naturaly.
To shutcho biscuit
The capital cities Springfield, Illinois and Frankfort, Kentucky border both the Mississippi and Ohio rivers.
They are formed as borders because they are formed naturally.
to the south
Arctic ocean
This town is Mangalia.
Mexico, Belize, Honduras and El Salvador
The Wild and Scenic Rivers Act was passed in 1968, during the same week as the National Trails System Act, in the shadow of the Wilderness Act (1964)
The united states of america:]
The one state that borders Mexico is Texas
Kansas Kansas
Both Missouri and Tennessee have the most number of borders with 8.