A natural boundary is a boundary that is defined by natural features, such as a strait, a mountain range etc. A physical boundary is can be an imaginary boundary that is drawn on a map, which is not shown in real life, something like a political boundary.
transform fault boundary
mountains
I think so
Himalaya Mountains.
the
the
The Mississippi river was the border.
No, they formed the eastern boundary, in the form of the continental divide.
In 1802, the Mississippi River formed the western boundary of the United States. The southern boundary extended to the 31st parallel north latitude.
The mountain range that formed the western boundary of the original states was the Appalachian Mountains. The mountains also extend into southeastern Canada.
The Appalachian Mountains.A wall of Mountains The 1,500-mile- long Appalachian Mountain range formed a natural barrier to westward expansion.
The Appalachian Mountains.A wall of Mountains The 1,500-mile- long Appalachian Mountain range formed a natural barrier to westward expansion.
black sea
Indiana begins at the western border of Ohio. Ohio is the western border is Pennsylvania
Indiana begins at the western border of Ohio. Ohio is the western border is Pennsylvania
Indiana begins at the western border of Ohio. Ohio is the western border is Pennsylvania