ここ そこ あそこ どこ
koko, soko, asoko, and doko are all words for places.
ここ here, near me
そこ there, near you
あそこ over there
どこ where
すみません、ゆうびんきょくはどこですか。 Excuse me, where is the post office?
sumimasen, yuubinkyoku wa doko desu ka.