Olszak [ˈɔlʂak] is a village in the administrative district of Gmina Babiak, within Koło County, Greater Poland Voivodeship, in west-central Poland.

[1] It lies approximately 2 kilometres (1 mi) south of Babiak, 15 km (9 mi) north of Koło, and 120 km (75 mi) east of the regional capital Poznań.

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