Plasma membrane or cell membrane
Radcliffe Line
a front.
Oder River
49 Parallel
The Mason - Dixon Line
The Iron Curtain.
The Ottawa River forms part of the boundary between the provinces of Ontario and Québec.
Ural Mountains.
San andreas.
The Ural Mountains.
This is known as the phreatic surface or water table.
The boundary between India and Bhutan is the only land entry point for citizens of Bhutan. The boundary is called the Bhutan-Indian Border.