Looking for Sarnek, Voln. (literal from brith act) #ukraine

Alberto Guido Chester

I have used the Jewishgen tools with no success.
A birth act in ROHATYN in 1911 says grandparents were from "Sarnek, Voln." which I guess might be Volinia (sp.)
The handwriting is very clear.
Any help to locate this place ?
Thanks in advance

Alberto Guido Chester
Buenos Aires, Argentina

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