Kossaki-Ostatki [kɔsˈsaki ɔsˈtatki] is a village in the administrative district of Gmina Rutki, within Zambrów County, Podlaskie Voivodeship, in north-eastern Poland.

[1] It lies approximately 6 kilometres (4 mi) west of Rutki-Kossaki, 15 km (9 mi) north-east of Zambrów, and 55 km (34 mi) west of the regional capital Białystok.

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