哪儿

哪兒
nǎr
  1. where?
  2. wherever; anywhere; somewhere
  3. (used in rhetorical questions) how can ...?; how could ...?

CEDICT

Entry Composition

=1 哪 nǎ
  1. how
  2. which
=1 哪 na (emphatic sentence-final particle, used instead of 啊 a after a word ending in "n")
2 儿 r
  1. non-syllabic diminutive suffix
  2. retroflex final