pronoun
Casual, somewhat vague way of asking about a general area or location. Similar to どこら, but どこいら is more colloquial and often implies a broader vicinity.
See also: どこら
どこいらが静かでいいですか。
Whereabouts is quiet and nice?
どこいらで昼ごはんを食べようか。
Whereabouts shall we have lunch?