どの辺
ど
の
へ
ん
Meanings
1
whereabouts; what part; which area
Asks about a physical location or a general area within a larger context. Often used when the speaker expects an approximate answer.
Whereabouts is the station?
What part (of your body) hurts?
2
how much; what point; to what extent
Asks about a degree, amount, or stage in a process. Common in questions about progress, understanding, or quantity.
How much of the work is done?
To what point did you understand the explanation?