Prostki
Prostki is a village in Ełk County , Warmian-Masurian Voivodeship , in northern Poland . 
<triplet> Ełk County <subj> Warmian-Masurian Voivodeship <obj> located in the administrative territorial entity <triplet> Warmian-Masurian Voivodeship <subj> Ełk County <obj> contains administrative territorial entity