Casual, colloquial expression for asking about a general location or area. Similar to どこら辺り, but slightly more informal.
See also: どこらあたり
今、どこら辺にいるの？
Whereabouts are you now?
駅はこのどこら辺ですか。
Where around here is the station?
どこ is the basic 'where'; どこら辺 asks for a broader area or approximate location.
Standard kana-mixed spelling; the kanji 辺 is commonly used in this expression.
Rarely used kanji form.
Combination of どこ (where) + ら (approximate suffix) + 辺 (area, vicinity). The exact derivation is uncertain, but it follows a common pattern for asking about approximate location.