Ask A Scientist© Astronomy Archive

Author:      eileenb
Where does the Earth end?

Response #:  1 of 1
Author:      asmith
Right beneath your feet! Really, the only meaning to "end" on the Earth is
the boundary between the inside (underground) and the outside (into the
atmosphere and space).  Other than that, the Earth is pretty much spherical,
so there is not any place on Earth that does not look pretty much like every
other place, as far as being able to walk off in any direction without
leaving the planet.  
Actually, there is another boundary, where the Earth's influence on the
neighboring region of space ends (also the atmosphere "ends" in a sense a
few hundred miles away) - this really extends for hundreds of thousands or
millions of miles though.