A question of mine on another SE site was corrected from:
I am trying to determine where on Earth has the lowest gravity.
I am trying to determine which on Earth's surface has the lowest gravity.
Why is "which" preferable to "where" in this sentence?
EDIT: The intent of the original sentence was to express "At which location at or near the surface of the planet Earth will an arbitrary mass experience the least acceleration roughly in the direction of the planet's center of mass, assuming that no outside forces are bearing on the mass."