118. The interrogative adverb of place, related to the interrogative
pronoun "kiu" is "kie", where, in (at) what place. If the verb in the
sentence expresses motion toward the place indicated by "kie", the
ending "-n" is added, forming "kien", whither (where):
Kie li estis kaj kien oni forpelis lin?
Where was he and whither did they drive him (away)?
Li miros kie lia nepo estas. He will wonder where his grandson is.
Mi ne scias kien li kuris. I do not know where (whither) he ran.