Kalisz is a city in central Poland with 103,738 inhabitants (June 2014), the capital city of the Kalisz Region. Situated on the Prosna river in the southeastern part of the Greater Poland Voivodeship, the city forms a conurbation with the nearby towns of Ostrów Wielkopolski and Nowe Skalmierzyce. See Kalisz County for the regional administrative area (powiat).