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Where does the Earth end?

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.

A Smith

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